It was narrated that Ibn 'Umar said:"The Messenger of Allah said: 'Whoever seeks refuge with (the name of) Allah, grant him refuge; whoever asks of you in (the name of) Allah, give him; whoever seeks protection with (the name of Allah, give him protection. Whoever does you a favor, then reciprocate, and if you cannot, then supplicate for him until you think that you have repaid him)

English translation · Sunan an-Nasa'i