Luke 12:24

“Consider the ravens, that they sow not, neither reap, which have no store-chamber nor barn, and God feeds them. Of how much more value are you than the birds!”

In considering such things let them think about the birds, even unclean birds like the ravens (or crows) - Leviticus 11:15. They do not sow nor do they reap. They do not pile up wealth like the rich fool. They do not build up large store-chambers which will last for many years. And yet God feeds them as He promised (see Psalms 147:9). In the same way those who give up their lives to follow Him can be sure that He will do the same for them also. Thus like the birds they need not spend their time worrying about such things.