Musnad Ahmad Hadith 11134

Abu Saeed Khudri (may Allah be pleased with him) narrates that once the Prophet (ﷺ) addressed the people and said: Allah Almighty gave one of His servants the choice between the world and coming to Him, and that servant chose to go to Allah. Upon hearing this, Siddiq Akbar (may Allah be pleased with him) began to weep. We were greatly surprised at his weeping, as the Prophet (ﷺ) had merely informed about a man; what was there to cry about? But later it became clear that by "servant" the Prophet (ﷺ) meant himself, and it became evident that Siddiq Akbar (may Allah be pleased with him) was the most knowledgeable among us. Then the Prophet (ﷺ) said: In terms of companionship and financial support, the person who has done the greatest favors to me among the people is Abu Bakr. If I were to take anyone as a close friend (khalil) other than my Lord, I would have taken Abu Bakr, but Islamic brotherhood and affection are sufficient. And except for Abu Bakr's door, all other doors opening into the mosque should be closed. The previous hadith is also narrated through this second chain of transmission.