Promissory oaths
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Oaths which bind the party to observe a certain course of conduct, or to fulfill certain duties, in the future, or to demean himself thereafter in a stated manner with reference to specified objects or obligations; such, for example, as the oath taken by a high executive officer, a legislator, a judge, a person seeking naturalization, an attorney at law.
Case v. People, 6 Abb. N. C. (N. Y.) 151