Will all of the Ummah of Muhammad (peace be upon him) ultimately receive the Prophet's intercession, even if a servant abandoned prayer, and what are the conditions for the Prophet's intercession for any individual from his Ummah?

It is hoped that everyone from this Ummah who died upon Tawhid (monotheism) will be included in the intercession of the Prophet, peace and blessings be upon him. It is reported in Sahih Muslim: "Every prophet has an answered supplication, and every prophet hastened to make his supplication. And I have reserved my supplication as intercession for my Ummah on the Day of Resurrection, and it will, Allah willing, reach whoever dies from my Ummah without associating anything with Allah."

Al-Tirmidhi and Abu Dawud narrated from Anas ibn Malik, who said: The Messenger of Allah, peace and blessings be upon him, said: "My intercession is for the people of major sins among my Ummah."

Al-Bukhari and Muslim narrated in the hadith of intercession for those who entered Hellfire that the Prophet, peace and blessings be upon him, will say: "Then I seek permission from my Lord, and He grants it to me, and He inspires me with praises by which I praise Him, which do not occur to me now. So I praise Him with those praises and fall down prostrating before Him. Then it will be said: 'O Muhammad, raise your head, speak and you will be heard, ask and you will be granted, intercede and your intercession will be accepted.' So I will say: 'O Lord, my Ummah, my Ummah!' It will be said: 'Go and take out from it whoever has in his heart the weight of a barley seed of faith.' So I will go and do that. Then I will return and praise Him with those praises, then I will fall down prostrating before Him. Then it will be said: 'O Muhammad, raise your head, speak and you will be heard, ask and you will be granted, intercede and your intercession will be accepted.' So I will say: 'O Lord, my Ummah, my Ummah!' It will be said: 'Go and take out from it whoever has in his heart the weight of an atom or a mustard seed of faith.' So I will go and do that. Then I will return and praise Him with those praises, then I will fall down prostrating before Him. Then it will be said: 'O Muhammad, raise your head, speak and you will be heard, ask and you will be granted, intercede and your intercession will be accepted.' So I will say: 'O Lord, my Ummah, my Ummah!' He will say: 'Go and take out from it whoever has in his heart the slightest, slightest, slightest weight of a mustard seed of faith.' So I will go and do that."

The Prophet, peace and blessings be upon him, mentioned in another hadith: "Then I will return a fourth time and praise Him with those praises, then I will fall down prostrating before Him. Then it will be said: 'O Muhammad, raise your head, speak and you will be heard, ask and you will be granted, intercede and your intercession will be accepted.' So I will say: 'O Lord, grant me permission concerning whoever said: La ilaha illallah (there is no god but Allah).' He will say: 'By My Might, My Majesty, My Grandeur, and My Greatness, I will certainly take out from it whoever said La ilaha illallah.'"