Muhammad's early efforts in preaching the new faith focused on the preaching of a single ideal: monotheism. Surahs of the Quran believed to have been revealed during this period, known as the Meccan surahs (), command Muhammad to proclaim and praise the name of Allah, instruct him not to worship idols or associate other deities with Allah and to worship Him alone, warn the pagans of their eschatological punishment, sometimes referring to the Day of Judgement indirectly, while providing examples from the history of some extinct communities. Early converts to Islam included Muhammad's wife, Khadija, his cousin Ali, his adopted son Zayd, his nursemaid Umm Ayman, and his friend Abu Bakr.