Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.033A.
Section : Salatul Hajah, the prayer for need. Ahmad has on sound authority reported from Abu Darda that the Prophet Sallallahu Alehi wasallam said: “He who makes wudu, and does it properly, then prays two rak’at, Allah will grant him…