Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, who says that the Messenger of Allah, peace and blessings be upon him, said: "When any person sees a disliked dream, he should change the side on which he was lying, spit three times to his left, ask Allah for the good of that (dream), and seek refuge from its evil."