Abu Darda’ reported God’s messenger as saying, “A Muslim’s supplication for an absent brother receives an answer. An angel is stationed at his head, and as often as he makes supplication that his brother may be given what is good the angel who is put in charge of him says, ‘Amen, and may you receive the like’.”
He reported God’s messenger as saying, “A servant is granted an answer provided he does not ask for anything sinful or for breaking ties of relationship, and provided he does not demand an answer quickly.” On being asked what demanding an answer quickly meant, God’s messenger replied, “It is when he says he has prayed and prayed and does not think he will be answered, so he grows weary in such circumstances and gives up supplication.”
Jabir reported God’s messenger as saying, “Do not invoke curses on yourselves, or on your children, or on your possessions lest you happen to do it at a time when God is asked for something and grants your requests.”
He reported God’s messenger as saying, “When one of you makes supplication he must not say, ‘O God, forgive me if Thou wilt, but must be definite and cherish a great desire, for nothing which God gives is burdensome to Him.”