The Prophet (ﷺ) said: If anyone seeks protection in Allah's name, grant him protection; if anyone begs in Allah's name, give him something; if anyone gives you an invitation, accept it; and if anyone does you a kindness, recompense him; but if you have not the means to do so, pray for him until you feel that you have compensated him.
Reference: Sunan Abi Dawud 1672 In-book : Book 9, Hadith 117 English translation : Book 9, Hadith 1668
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