Assertory oath
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
One relating to a past or present fact or state of facts, as distinguished from a "promissory" oath which relates to future conduct; particularly, any oath required by law other than in judicial proceedings and upon induction to office, such, for example, as an oath to be made at the custom-house relative to goods imported.
Defined under Oath in Black's Law Dictionary.