Verses with the word keepest in the Old Testament (3 verses):

1 Kings 8:23
And he said, LORD God of Israel, there is no God like thee, in heaven above, or on earth beneath, who keepest covenant and mercy with thy servants that walk before thee with all their heart:

2 Chronicles 6:14
And said, O LORD God of Israel, there is no God like thee in the heaven, nor in the earth; which keepest covenant, and shewest mercy unto thy servants, that walk before thee with all their hearts:

Nehemiah 9:32
Now therefore, our God, the great, the mighty, and the terrible God, who keepest covenant and mercy, let not all the trouble seem little before thee, that hath come upon us, on our kings, on our princes, and on our priests, and on our prophets, and on our fathers, and on all thy people, since the time of the kings of Assyria unto this day.