By the sweat of your brow you will eat your food -Genesis 3:19
Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them- Mathew 6:26
Does the above two sayings contradict?
The full context is that this was said to Adam, (as to Eve it was said that thou will bear children with great pain).
These two things were actually as a punishment to them when they were thrown out of the Garden of Eden having disobeyed God.
'Birds of the air' were not Punished for anything, as such ... so, no point in trying to find contradiction in these two sayings ... as they are not on the same plane ('Punishment' is not common to both), except in the matter of food and feeding ...