Overall meaning : Allah Almighty says: Believers, what is the matter with you that when you are asked to fight in the cause of Allah you cling lazily and incline to stay at home?! Are you content with the transitory pleasures of this life instead of the eternal delights of the life to come? The enjoyment of this worldly life is rather insignificant compared to that of the life to come. Unless you engage in the fight in Allah’s cause when you are summoned to it, Allah will punish you severely and replace you by other people who will readily respond to the call of fighting in Allah’s cause, and you will not harm Him in the least if you do not do so. Allah has power over all things.
If you do not assist Muhammad, may Allah bless him and grant him peace, then Allah will assist him, just as He assisted him before when he found himself compelled to leave Makkah, and he was only one of two—there was no one with him except Abu Bakr, may Allah be pleased with him—when they were hiding from the Quraysh in a cave in Mount Thawr. He turned to Abu Bakr and said, ‘Do not grieve, for Allah is with us.’ Then Allah sent down His tranquillity on the Messenger of Allah, may Allah bless him and grant him peace, and strengthened him with armies of angels, which you did not see and made the word of the unbelievers the lowest. As for the Word of Allah is inherently the uppermost. Allah is All-Mighty, All-Wise.