It is narrated from Samurah bin Jundub (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) led the morning prayer, after the prayer he would turn towards us and say: "Whoever saw a dream last night, let him relate it, and I will interpret it for him." (and the rest of the hadith).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3029