وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّهُ كَانَ يَقُولُ فِي هَذِهِ الآيَةِ ‏{‏لَهُمُ الْبُشْرَى فِي الْحَيَاةِ الدُّنْيَا وَفِي الآخِرَةِ‏}‏ ‏.‏ قَالَ هِيَ الرُّؤْيَا الصَّالِحَةُ يَرَاهَا الرَّجُلُ الصَّالِحُ أَوْ تُرَى لَهُ ‏.‏

Yahya related to me from Malik from Hisham ibn Urwa that hisfather said about this ayat, "You have good news in the life of thisworld and the next world," (Sura 10 ayat 64), that it was the gooddream which the man who was salih saw or which was shown to him. Translation Not Available

Book reference: Muwatta Imam Malik Book 52 Hadith 1755
Web reference: Muwatta Imam Malik Book 52 Hadith 5