Matthew Poole and continuators on Deuteronomy 21:15

15 If a man have two wives , one beloved, and another hated , and they have born him children, both the beloved, and the hated: and if the first-born son be hers that was hated:

Either 1. both together: which practise, though tolerated, is not hereby made lawful, but onely provision is made for the children in that case. Or 2. one after another.

Comparatively, i. e. less loved, as Gen. 29. 31. Mat. 6. 24. Luk. 14. 26.