It is narrated from Ikrimah, he says: Sayyiduna Ibn Abbas (may Allah be pleased with him) said to me and my son Ali: Go to Abu Sa'id Khudri (may Allah be pleased with him) and listen to hadith from him. So we went, and he was sitting in his garden. When he saw us, he gathered his cloak and came to sit with us and began narrating hadith to us (or conversing with us) until the mention of the construction of the (Prophet's) Mosque came up. He said: We were each lifting one brick, and Sayyiduna Ammar bin Yasir (may Allah be pleased with him) was lifting two bricks at a time. When the Messenger of Allah (peace and blessings be upon him) saw him, he began to dust the dirt off his body and said: "Ammar! Why don't you carry one brick like your companions?" He said: "I want to earn more reward from Allah." The Prophet continued to dust the dirt off his body and kept saying: "Alas! Ammar will be killed by a rebellious group; he will call them to Paradise, but they will call him to Hellfire." Upon hearing this, Sayyiduna Ammar (may Allah be pleased with him) said: "I seek refuge with Allah from tribulations."