Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) said at Mina: "If the people of Jam' (Muzdalifah) knew with whom they have alighted, or (he said:) with whom they have stopped, they would rejoice at the glad tidings of the bounty of their Lord after the forgiveness."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10975