Ali criticized him in these words...

Ali criticized him in these words: "A person who constructs a mosque, whether sitting or standing, constantly endeavours for its progress is not like him, who keeps away from dust and is not prepared to stain his clothes for constructing the mosque''.[^1] 'Ammar Yasir, who was a strong man, collected some stones and carried them for the construction of the mosque. Some persons took undue advantage of his simplicity and loaded on him stones, which were too heavy for him.

He was heard saying: "I am carrying one stone on my own behalf and the other on behalf of the Prophet". One day the Prophet saw him bearing a heavy burden, when three stones had been loaded on him. 'Ammar complained: "Your companions nurse ill-will against me and want to kill me. They themselves bring one stone each but load as many as three on me". The Prophet held him by the hand, cleansed the dust on his back, and uttered this historical sentence: "They are not your murderers.

You will be killed by a group of oppressors while you will be inviting them to truth and reality". ^2 This prediction is one of the proofs of the prophethood and truthfulness of the Prophet. Eventually the same thing, which he had predicted happened, because 'Ammar, who was with Imam Ali, the Commander of the Faithful in the Battle of Siffin and was 90 at that time was killed at the hands of the supporters of Mu'awiyah.

This occult news continued to have a wonderful effect on 'Ammar throughout his lifetime. After this event Muslims considered him to be the pivot of truth and every rightfulness was measured by its association with him. When 'Ammar was killed in the battle, a strange tumult appeared in the ranks of the Syrians. People who entertained doubts about the rightfulness of Ali on account of the venomous propaganda of Mu'awiyah and 'Amr 'As became enlightened.

Huzaymah bin Thabit Ansari had gone to the battlefield with Imam Ali, but was double-minded about taking part in the battle. However, when he heard that 'Ammar had been killed he drew his sword and attacked the Syrians. Zul Kala' Himyari accompanied by twenty thousand men of his tribe came to fight against Ali. This was the man on whose support Mu'awiyah mainly relied and did not decide to wage war until he was sure of his co-operation.

When this misguided chief came to know that 'Ammar Yasir was with Ali he was very much upset.