[Taubah 9:37] Their postponing of the months is nothing but furtherance in disbelief - the disbelievers are misled by it - they decree it lawful in one year and regard it forbidden in another year, in order to equate to the number of the months which Allah has made sacred, and to make lawful what Allah has forbidden; their evil deeds seem good in their sight; and Allah does not guide the disbelievers.
[Taubah 9:38] O People who Believe! What is the matter with you, that when it is said to you, "Migrate in Allah's cause", you sit on the ground with heaviness? Have you preferred this worldly life over the Hereafter? And the wealth of the life of this world, in comparison with the Hereafter, is but only a little.
[Taubah 9:39] If you do not migrate, He will afflict you with a painful punishment and bring other people in your stead and you will not be able to harm Him in the least; and Allah is Able to do all things.
[Taubah 9:40] If you do not help him (Prophet Mohammed
- peace and blessings be upon him), Allah has helped him - when he
had to go forth due to the mischief of the disbelievers, just as two men
* - when they were in the cave, when he was saying to his companion "Do
not grieve; indeed Allah is with us"; then Allah caused His calm to descend
upon him and helped him with armies you did not see, and disgraced the
word of the disbelievers; and Allah’s Word is supreme; and Allah is the
Almighty, the Wise. (* The Holy Prophet migrated only with S. Abu Bakr
(who later became the first caliph) as his sole companion.)