Musnad Ahmad Hadith 22348

It is narrated from Abu Mas'ud (may Allah be pleased with him) that once the Holy Prophet (peace and blessings of Allah be upon him) delivered a sermon before us, and after praising and glorifying Allah, he said: "Some of you are hypocrites, so whoever's name I mention should stand up." Then the Holy Prophet (peace and blessings of Allah be upon him) said to a man, "O so-and-so! Stand up." In this way, the Holy Prophet (peace and blessings of Allah be upon him) mentioned the names of 36 men. Then he said, "These people were among you, so fear Allah." Shortly after, Umar (may Allah be pleased with him) passed by a man who had covered his face, and he was among those whose names the Holy Prophet (peace and blessings of Allah be upon him) had mentioned, and Umar (may Allah be pleased with him) recognized him. He asked him, "What happened to you?" He replied, "The Holy Prophet (peace and blessings of Allah be upon him) said this today." Umar (may Allah be pleased with him) said, "Go away."