en_tn_condensed/deu/10/16.md

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Therefore

"Because of this"

circumcise the foreskin of your heart

The word "foreskin" refers to the fold of skin on a man's private parts that is removed during circumcision. Here Moses is referring to a spiritual circumcision. This means the people must remove the sin from their lives.

no longer stiffen your necks

"stop being stubborn"