Ruling 2667 — Vow (Nadhr) and Covenant (ʿAhd)

If a person vows to perform his obligatory prayers (ṣalāh) in a place where there is no particular reason for one to receive more reward for performing prayers there – for example, he vows to perform prayers in an ordinary room – then, in the event that performing prayers there is legally better from some aspect – for example, due to the solitude there one is able to perform prayers with presence of heart – in such a case, if he makes a vow concerning this aspect, his vow is valid.