Ibn Jarīr recorded that Yazīd bin Abi Maryam said:
“Umar, may Allāh be pleased with him, passed by Mu’ādh bin Jabal and asked,
‘What is the foundation of this Ummah?’ Mu’ādh said, “Three things, and they
are the things that will bring salvation: Al-Ikhlāṣ (doing a deed for Allāh alone), which is
the Fiṭrah with which Allāh
created mankind; Ṣalāh, which is the thing that tells a believer apart from a
disbeliever; and obedience, which is protection.’ ‘Umar said: ‘You have spoken
the truth.”
Aṭ-Ṭabari 20:98.
Source: Tafsir Ibn Kathir (Abridged) Volume 7, page. 546, Darussalam