Verses with the word sufficiently in the Old Testament (2 verses):

2 Chronicles 30:3
For they could not keep it at that time, because the priests had not sanctified themselves sufficiently, neither had the people gathered themselves together to Jerusalem.

Isaiah 23:18
And her merchandise and her hire shall be holiness to the LORD: it shall not be treasured nor laid up; for her merchandise shall be for them that dwell before the LORD, to eat sufficiently, and for durable clothing.