Adi bin Thabit al-Ansari says: A man narrated to me that he was with Ammar bin Yasir (may Allah be pleased with him) in al-Mada'in. The iqamah for the prayer was called, and Ammar (may Allah be pleased with him) stepped forward and stood on a raised place to lead the prayer, while the people were below. Hudhayfah (may Allah be pleased with him) stepped forward and took hold of his hands. Ammar (may Allah be pleased with him) followed him until Hudhayfah (may Allah be pleased with him) brought him down. When Ammar (may Allah be pleased with him) finished the prayer, Hudhayfah (may Allah be pleased with him) said: Did you not hear the Prophet (peace and blessings be upon him) say: "When one of you leads the people, he should not stand in a place higher than those following him"? Ammar said: "That is why I followed you when you took hold of my hands."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5235