Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah
Narrated Ibn ‘Abbas (Radi-Allahu ‘anhu):
Sad bin Ubada consulted Allah’s Apostle (Sallallahu ‘Alaihi Wa Sallam) saying, “My mother died and she had an unfulfilled vow.” The Prophet (Sallallahu ‘Alaihi Wa Sallam) said, “Fulfill it on her behalf.”
Bukhari Vol. 4 : No. 23