Narrated Ibn ‘Abbas quoted the Prophet as saying, “Five supplications receive an answer:
that of one who is wronged till help comes, that of a pilgrim till he comes home, that of one engaged in jihad till he stops, that of a sick person till he recovers, and that of someone for an absent brother. Then he added, “The one of those which gets the quickest answer is that for an absent brother.”
Narrated Abu Sa'id al-Khudri reported the Prophet as saying, “Any Muslim who makes a supplication containing nothing which is sinful or which involves breaking ties of relationship will be given for it by God one of three things:
He will give him as peedy answer, or store it up for him in the next world, or turn away from him an equivalent amount of evil.” Those who heard it said they would then make many supplications and he replied that God was more ready to answer than they were to ask.
Abu Huraira and Abu Said reported God’s messenger as saying, “People will not sit remembering God without the angels surrounding them, mercy covering them, peace(1) descending on them, and God mentioning them among those who are with Him.”
1. Here I have translated as-sakina as "peace” , but cf. p.448, n. 2.
