Ahmadiyya Khalifa, Mirza Masroor Ahmad and also all other Ahmadiyya Khulafa are seen as successors of both the promised messiah and Muhammad, though human and in no way incarnations of God or any other status which would jeopardize the concept of the Unity of God (see: Non-divinity of Prophets). Though the caliphs, like the prophets, are deemed completely pure and sinless, much like in Shia Islam (see: ‘Isma), however, they, like prophets, are not deemed immune from making mistakes pertaining to worldly affairs of everyday life or human errors in judgement. Ahmadiyya belief dictates that prophethood is Qudrat Al-Awwal or the ‘first manifestation of God's omnipotence and rightly-guided caliphate’ (usually taken to mean the Ahmadiyya Caliphate) is a form of Qudrat Ath-Thaani or the ‘second manifestation of God's omnipotence’. However, in no way does the Ahmadiyya Community deem the Ahmadiyya Caliphate to be better than the Pious Caliphate of Muhammad because it has spanned a longer time or seen more caliphs. Non-divinity of Prophets The prophets of God are not seen as incarnations of God but are seen as mortal humans, as they have all died, according to Ahmadiyya belief (including Jesus, who according to Ahmadiyya belief died and his body is not currently in Heaven right now as according to Orthodox Islamic and Christian belief). Each messenger is seen to have been an ordinary human who displayed righteousness and honesty to a degree that was not found even remotely in his society of the time. Then, according to Ahmadiyya belief, God is thought to have selected this pious human and told him his divine station of prophethood. God would then, invest the Holy Spirit (Arabic: rohil-Quddos) within the newly appointed prophet and the prophet would become a ‘manifestation of God‘, though still a human being and not divine in his own right. Prophets are not regarded as God, God's sons, incarnations of God, or in any other way which would put the unity of God, the concept of Islamic (tawhid) or the declaration of faith in jeopardy. The first part of the shahadah, the essential declaration of a Muslim, states: "There is no god but Allah" and another version of the same is "There is none worthy of worship except Allah". The word Allah, according to Ahmadiyya belief, is a personal name of God, is a proper noun and is not a combination or a derivative of any other