'Sparrows' in the Bible

Are not two sparrows sold for a farthing? and one of them shall not fall on the ground without your Father.

Fear ye not therefore, ye are of more value than many sparrows.

Are not five sparrows sold for two farthings, and not one of them is forgotten before God?

But even the very hairs of your head are all numbered. Fear not therefore: ye are of more value than many sparrows.