Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Noble Prophet (peace and blessings of Allah be upon him) said: "Whoever seeks refuge with you by Allah's name, grant him refuge; and whoever asks you by Allah's name, give to him; and whoever invites you, accept his invitation; and whoever seeks your help for Allah's sake, help him; and whoever does good to you, repay him, and if you do not have the means to repay him, then pray for him (and pray so much) until you feel that you have repaid him."