Allah protected Ammar bin Yasir (may Allah be pleased with him) from Satan by the tongue of His Prophet (peace and blessings be upon him)

It is narrated from Khaythamah bin Abi Sabrah al-Ju'fi that he said: I came to Madinah and asked Allah to grant me a righteous companion to sit with, and Allah made Sayyiduna Abu Hurayrah (may Allah be pleased with him) available to me. I sat with him and said: I asked Allah for a righteous companion, and He brought me to you. He asked me: Where are you from? I said: From the land of Kufah; I have come seeking knowledge and goodness. He said: "Are there not among you Sayyiduna Sa'd bin Malik (Sa'd bin Abi Waqqas), whose supplication is answered; and Abdullah bin Mas'ud, who looked after the ablution water and the sandals of the Messenger of Allah (peace and blessings be upon him); and Hudhayfah bin al-Yaman, the keeper of the secrets of the Messenger of Allah (peace and blessings be upon him); and Ammar bin Yasir, to whom Allah granted protection from Satan upon the tongue of His Prophet (peace and blessings be upon him); and Salman (al-Farisi), the scholar of the two Books?" Qatadah said: The two Books mean the Injil (Gospel) and the Qur'an (al-Furqan).
The chain of this hadith is sahih (authentic), but the two Shaykhs did not record it.

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Ammar is filled with faith (in every fibre of his being and) down to the joints of his bones."
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), if Muhammad bin Abi Ya'qub preserved it (accurately) from Abd al-Rahman bin Mahdi.