Verses with the word chiefly in the New Testament (3 verses):

Romans 3:2
Much every way: chiefly, because that unto them were committed the oracles of God.

Philippians 4:22
All the saints salute you, chiefly they that are of Caesar's household.

2 Peter 2:10
But chiefly them that walk after the flesh in the lust of uncleanness, and despise government. Presumptuous are they, selfwilled, they are not afraid to speak evil of dignities.