Luke 12:6

New English Translation

⁶Aren’t five sparrows sold for two pennies?^[a] Yet not one of them is forgotten before God.^[b]

Luke 12:6 sn The pennies refer to the assarion, a small Roman copper coin. One of them was worth one sixteenth of a denarius or less than a half hour’s average wage. Sparrows were the cheapest thing sold in the market. The point of Jesus’ statement is that God knows about even the most financially insignificant things; see Isa 49:15.
Luke 12:6 sn This is a typical form of rabbinic argumentation, from the lesser to the greater: If God cares about the lesser thing (sparrows) how much more does he care about the greater thing (people).

Luke 12:7

New English Translation

⁷In fact, even the hairs on your head are all numbered. Do not be afraid;^[a] you are more valuable than many sparrows.

Luke 12:7 sn This represents the second call by Jesus not to be afraid in the section (previously in v. 4). Since the previous reference was related to fear of persecution, it is probable that this one does as well. Once again the sparrows are mentioned and the argument is from lesser to greater (if God cares about individual hairs on the head and about sparrows, how much more does he care about people).

New English Translation (NET)