Some of the special things about Abū Bakr and his relationship with the Prophet (may Allāh praise him and Peace be upon him)
He was his companion for the migration from Makkah to Madīnah and he led the prayer during the Prophet’s (may Allāh praise him and Peace be upon him) life.
[Faḍā`il Al Ṣaḥābah by Imām Aḥmad]