Abu Usaid reported that the Messenger of Allah (ﷺ) said: When any one of you enters the mosque, he should say: "O Allah! open for me the doors of Thy Mercy" ; and when he steps out he should say: 'O Allah! I beg of Thee Thy Grace." (Imam Muslim said: I heard Yahya saying: I transcribed this hadith from the compilation of Sulaiman bin Bilal (RA) ).
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A hadith like this has been narrated from the Apostle of Allah (ﷺ) by Abu Usaid.
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Related hadith on this topic
Explanation & Benefits
Hafiz Muhammad Ameen
730. Commentary: When entering, the aim is to attain Allah’s mercy, and upon coming out, one engages in seeking sustenance; therefore, both supplications are appropriate to their respective occasions. By “mercy” is meant blessings of the Hereafter and forgiveness. “Fadl” (bounty) refers to both worldly blessings and sustenance.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 730