'Sparrows' in the Bible

Are not sparrows two a farthing? and not one of them comes to an end without your Father:

Then have no fear; you are of more value than a flock of sparrows.

Are not five sparrows given in exchange for two farthings? and God has every one of them in mind.

But even the hairs of your head are numbered. Have no fear: you are of more value than a flock of sparrows.