David did not take the number of the men twenty years old or less, because the LORD had promised to make Israel as numerous as the stars in the sky.
NIV
But David did not number those under twenty years of age, for the Lord had promised to make Israel as the stars of the heavens.
AMP
But David took not the number of them from twenty years old and under: because the LORD had said he would increase Israel like to the stars of the heavens.
KJV