3 occurrences across the corpus

KJV Apocrypha (Eastern Orthodox Additions)

3 Maccabees 6:33

So the king also collected a number of guests for the occasion, and returned unceasing thanks with much magnificence for the unexpected deliverance afforded him.

1 Enoch

1 Enoch 99:6

And again I swear to you, ye sinners, that sin is prepared for a day of unceasing bloodshed.

OT Pseudepigrapha

The Letter of Aristeas 7:33

After pondering for a moment he replied, 'You could best establish its security if you were to imitate the unceasing benignity of God. For if you exhibit clemency and inflict mild punishments upon those who deserve them in accordance with their deserts, you will turn them from evil and lead them to repentance.' [*1]