And the 155th prohibition is that we are forbidden from delaying nedarim,1 nedavos,2 or any other sacrifices which we are obligated to bring.

The source of this prohibition is G‑d's statement3 (exalted be He), "When you make a pledge to G‑d your L‑rd, do not be late in paying it."

The Oral Tradition teaches us that one does not transgress this prohibition until three festivals have passed.

The details of this mitzvah are explained in the beginning of tractate Rosh Hashanah.4