The reference to the hairs of your head
stresses that not even a hair will fall from our heads without his will. Hair
here is a figure of speech (1 Samuel 14:45;2 Samuel 14:11; 1 Kings 1:52), showing that God’s providence extends to even the finest details in the disciples’ lives. The care of our Father for the tiniest details in our lives is good reason for us not to fear (Matthew 10:31). A person has an uncounted number of hairs, but God knows the exact number on each of our heads.
The reference to the hairs of your head
here needs to be understood as highlighting the fact that even as not a single sparrow will fall on the ground without the will of the Father, so not even a hair will fall from their heads without his active involvement. Hair
here needs to be understood as a figure of speech (see 1 Samuel 14:45; 2 Samuel 14:11; 1 Kings 1:52) and serves to indicate that God’s providence encompasses even the finest details in the lives of the disciples.1 That we have the kind of Father who cares even for the smallest details in our lives is sufficient reason for us not to be fearful (Matthew 10:31). The image of the hair upon our heads is one commonly used in the Old Testament (see 1 Samuel 14:45; 2 Samuel 14:11; 1 Kings 1:52). Hairs are things a person has an innumerable number of, and yet at the same time there is almost no part of the body that people think of so little of as they do of hair. Yet God knows the exact number of each of our heads.2
29 Are not two sparrows sold for a penny?And not one of them will fall to the ground apart from your Father.