Ibn ‘Umar reported God’s messenger as saying, “If anyone seeks protection in God’s name grant him protection; if anyone begs in God’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 recompensed him.” Ahmad, Abu Dawud and Nasa’i transmitted it.