Explanation of the author's statement: "… And among the proofs of the Sunnah is his saying (peace and blessings be upon him): 'The best of faith is that you know that Allah is with you wherever you are.'"

The Shaykh : He said: "And among the proofs of the Sunnah is his saying (peace and blessings be upon him)

The best of faith is that you know that Allah is with you wherever you are

أفضل الإيمان أن تعلم أن الله معك حيثما كنت

" This hadith is weak in terms of its chain of narration, but some scholars have graded it as good, stating that it is a good hadith. The best of faith is that you know that Allah is with you wherever you are, because if you know this and are certain of it, you will be mindful of Allah (Mighty and Majestic). If you know that if you are on the roof, Allah (Glorified and Exalted is He) is with you, but not on the roof; if you are in the room, Allah is with you, but not in the room. He is above the heavens, on His Throne, above His heavens. So you will be mindful of Allah (Mighty and Majestic), because the opposite of that is negligence, where you do not feel that Allah is watching you. And if you do not feel that Allah is watching you, you will violate the forbidden things and be lax in the obligatory ones; you will be lax in the obligatory ones. But if you know this knowledge, it will necessitate for you the perfection of mindfulness of Allah (Glorified and Exalted is He). And for this reason Now, if you worship Him as if you see Him, does He see you? Yes, but the Messenger (peace and blessings be upon him) explained two levels of mindfulness. The first level is that you worship Allah as if you see Him, and the second level is that you worship Allah as if He sees you. The first level is a level of seeking and longing, as if you see Him and you want to reach Him. The second level is a level of fear and fleeing, if you do not see Him, then He sees you.
He said: "And his saying (peace and blessings be upon him) to his companion Abu Bakr while they were in the cave:

Do not grieve; indeed Allah is with us.

لا تحزن إن الله معنا

[At-Tawbah 9:40]

" Is the word 'do not grieve' here to be taken at its apparent meaning? It is known that grief is regret for what has passed, and fear is for what is expected. So grief is for what has passed, and fear is for what is expected. Here, is the intended meaning of 'grief' its apparent meaning, i.e., do not grieve for what has passed, or is the intended meaning fear? Yes, some scholars said: "The intended meaning is fear". Yes, as you said, meaning do not fear for us, for Allah is with us. Yes, and it is possible that the apparent meaning of 'grief' is intended, and the meaning is do not grieve over what happened, for there is no fear for us. Because a person may grieve over what occurred and wish it had not happened. This is undoubtedly in accordance with the apparent wording, but it is far from the state of Abu Bakr (may Allah be pleased with him). That Abu Bakr was regretful about what happened to them is far-fetched. The closest is that 'grief' here means fear, meaning do not bear anxiety for the future, for Allah is with us. And it is known that Abu Bakr did not understand when the Prophet (peace and blessings be upon him) said to him that Allah was in the cave itself, absolutely not. And it is not possible for one who knows the greatness of Allah (Glorified and Exalted is He) to imagine that Allah the Exalted is with the creation in their places. Rather, He (Glorified and Exalted is He) is above His Throne. But despite that, He is with them because He (Glorified and Exalted is He) is All-Knowing of them, All-Comprehensive of them, in hearing, sight, power, management, and so on.