Abu Salamah narrates that once on Marwah, Sayyiduna Ibn Amr (may Allah be pleased with him) and Sayyiduna Ibn Umar (may Allah be pleased with them both) met. After a brief conversation, when Sayyiduna Ibn Umar (may Allah be pleased with them both) returned, he was crying. Someone asked him, "O Abu Abdur Rahman, why are you crying?" He replied: "Because of the hadith which he has narrated to me, that he heard the Noble Prophet (peace and blessings be upon him) say: 'Whoever has even a mustard seed's weight of arrogance in his heart, Allah will throw him face down into Hell.'"