¶1The bill was filed by the appellee, to enforce a lien for the unpaid purchase-money of a tract of land sold by him to the appellant in 1867. The lands were purchased by the appellee in 1864, from one Carmichael. When this purchase was made, there was a subsisting judgment against said Carmichael in the circuit court of Talladega, in which county the lands were situated, rendered in 1860. When the sale to the appellant was made, the appellee had knowledge of this judgment against Carmichael, and knew that it was as*153serted as a lien on the land. He avowed to others a purpose to sell the lands, obtain a partial payment in cash, and leave the purchaser and the judgment creditor to contest the lien of the judgment between themselves. He concealed from the appellant the existence of the judgment, and the lien which was claimed for it. He received a part of the purchase-money in cash, and for the residue the two notes now sought to be enforced as a lien on' the land. He covenanted to make the appellant a good title on payment of the purchase-money. When the execution on the judgment in favor of Carmichael was levied on the lands, he promised to attend the sale, and to purchase the lands for the protection of the appellee. He received from Carmichael, his vendor, indemnity against the judgment. He failed to attend the sheriff’s sale; and the appellee, to protect himself against an adverse title, if the lands should be purchased at the sale by another, bid them in, paying $825, and receiving the sheriff’s deed. At this time, both uthe appellant and the appellee regarded the judgment against Carmichael, and the execution thereon under which the sale was made, as a valid lien on the lands, paramount to the title of the appellee ; but this court, subsequently, declared the statute creating the lien to be unconstitutional. Martin v. Hewitt, 44 Ala. 418, and other cases decided on its authority. And the appellee now insists, that, as there was no lien attached to the execution, the appellant is not entitled to a deduction from the unpaid purchase-money of the sum so paid by him for the lands at sheriff’s sale.
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¶5It is true that, in contemplation of law, all its rules, and principles are deemed certain, although they may not have been the matter of public adjudication. The theory is, Id certum est, quod oertum reddi potest; and that the province of *155judicial decisions is, not to make, but to declare the law. When the courts have pronounced the law, and it has become known to, and recognized in the community, though subsequent research and a more deliberate examination may compel a reversal of the decision, ignorance or mistake of the law cannot be invoked or imputed, to work a forfeiture of rights acquired under the former decision. The peace of the community ; the quieting of litigation ; the repose of titles; the confidence judicial decisions should inspire; every consideration of policy, inducing the acceptation of the maxim that ignorance or mistake of law will not excuse, concur in compelling us not to give the decision in Martin v. Hewitt, and subsequent cases, a retrospective operation, which would, contrary to the intention of parties, defeat acts done, or contracts executed, in reliance on former adjudications.
¶6In considering this question, Chancellor Kent, in Lyon v. Richmond (2 Johns. Ch. 59), says: “ Much was said respecting a decision of the court of errors in another cause, in the year 1813, by which it is inferred, that if the sureties had been permitted to have prosecuted a writ of error on the judgment against Richmond, they would have been successful. Whether this would have been the case, and the judgment against Richmond, and the judgment reversed on error in 1813, have been deemed so analogous in their circumstances as to have led to the same conclusion, is a question not before me, and which I shall not undertake to decide. I have nothing to do with such an inquiry. A subsequent decision of a higher court, in a different case, giving a different exposition of a point of law from the one declared and known when a settlement between parties takes place, cannot have a retrospective effect, and overturn such settlement. The courts do not undertake to relieve parties from their acts and deeds fairly done on a full knowledge of facts, though under a mistake of the law. Every man is to be charged at his peril with a knowledge of the law. There is no other principle which is safe and practicable in the common intercourse of mankind. And to permit a subsequent judicial decision ip any one given cáse, on a point of law, to open or annul everything that has been done in other cases of the like kind for years before, under a different understanding of the law, would lead to the most pernicious consequences. Fortunately for the peace and happiness of society, there is no such pernicious precedent to be found. This case, therefore, is to be decided according to the existing state of things when the settlement in question took place.”
¶7When the appellant made the purchase at sheriff’s sale, according to the law as then announced, he was removing an incumbrance on the title the appellee had warranted. He *156converted a threatened total breach of the appellee’s covenant, which would have rendered him liable to refund the money appellant had paid him, and operated an entire rescission of the sale, into one partial in its character, subjecting him only to a set-off, or recoupment, of the sum reasonably paid for the extinguishment of the incumbrance. No diligence on the part of the appellant could have imparted to him any knowledge of the legal invalidity of the supposed incumbrance. No notice to him of that invalidity, or that it was so regarded by the appellee, was given. On the contrary, the appellee shared in his ignorance or mistake of the law, and had promised performance of the duty primary upon him in legal contemplation,— the removal of the incumbrance. It would be a reproach to the law, if the appellee could resist the claim of the appellant. It would give him an inequitable and unconscientious advantage, and subject the appellant to a loss he should not in sound morals bear.
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¶9The appellant was, in every view of the case, entitled to a deduction from the unpaid purchase-money, of the sum he paid for the lands at sheriff’s sale. The chancellor erred in not so decreeing; and for that error the decree is reversed, and the cause remanded.
¶10The majority of the court do not consider themselves bound, except as to the result of the opinion in this case. Upon the reasons and numerous points involved in the discussion that leads to it, they express no opinion.