Construction of the Prophet's (sa) Mosque
Ikrama narrates: “Hazrat Abdullah bin Abbas (ra) said to him [Ikrima] and Ali bin Abdullah, his own son, ‘Go to Abu Sa‘eed Khudhri and listen to what he says.’ We went to meet him and saw that he was watering his orchard with his brother. When they saw us they sat down on the ground with their legs crossed [in a comfortable manner] and then said, ‘During the construction of the Prophet’s mosque, we would carry each brick separately and Ammar bin Yasir would bring two bricks at a time. The Holy Prophet (sa) walked past him and removed the dust off of Hazrat Ammar’s (ra) head and said, ‘What a pity! The rebellious group will kill him. Ammar will call them towards God and they will call him towards fire.’”
(Sahih Al-Bukhari, Kitab-ul-Jihad Wa Al-Sair, Hadith 2812)
Thus, Hazrat Ammar (ra) would always pray to God Almighty to protect him from all forms of evil.
(At-Tabaqat Al-Kubra, Vol. 3, p. 194, Ammar bin Yasir, Dar-ul-Ihya At-turath Al-Arabi, 1990, Beirut)
Abdullah bin Abi Huzail narrates, “When the Messenger (sa) of God was constructing his mosque, everyone was carrying the bricks and stones. The Holy Prophet (sa) and Hazrat Ammar (ra) were also doing the same. Hazrat Ammar (ra) was reciting the following couplet:
نَحْنُ الْمُسْلِمُوْنَ نَبْتَنِي الْمَسَا جِدَا
That is, ‘We are Muslims who build Mosques.’ The Holy Prophet (sa) would also repeat those words with him. Prior to this, Hazrat Ammar (ra) had been ill and therefore some people said that Ammar (ra) would surely die that day because he was working in a state while recovering from illness and weakness. Upon hearing this, the Holy Prophet (sa) dropped the bricks from Hazrat Ammar’s hand and instructed him to rest.”
(At-Tabaqat Al-Kubra, Vol. 3, p. 190, Ammar bin Yasir, Dar-ul-Ihya At-turath Al-Arabi, 1990, Beirut)
Even in a state of severe weakness, the Companions (ra) did not want to be deprived from offering their services.