3 occurrences across the corpus

OT Pseudepigrapha

Testament of Reuben 2:1

PAY no heed, therefore, my children, to the beauty of women, nor set your mind--on their affairs; but walk in singleness of heart in the fear of the Lord, and expend labour on good works, and on study and on your flocks, until the Lord give you a wife, whom He will, that ye suffer not as I did.

The Letter of Aristeas 1:9

For neither the pleasure derived from gold nor any other of the possessions which are prized by shallow minds confers the same benefit as the pursuit of culture and the study which we expend in securing it.

The Letter of Aristeas 5:17

For great is the energy which they expend on the tillage of the soil.