en_tn_lite_do_not_use/exo/08/18.md

This is the finger of God

The words "finger of God" represent the smallest example of God's workmanship. (See: rc://en/ta/man/translate/figs-metonymy)

Pharaoh’s heart was hardened

This means Pharaoh broke his promise and became stubborn again. (See: rc://en/ta/man/translate/figs-idiom)