Verse 12. Into covenant - The matter of this covenant was nothing but what they were before obliged to. And tho' no promise could lay any higher obligation upon them, than they were already under, yet it would help to increase their sense of the obligation, and to arm them against temptations. And by joining all together in this, they strengthened the hands of each other
Verse 15. Rejoiced at the oath - The times of renewing our covenant with God, should be times of rejoicing. It is an honour and happiness to be in bonds with God. And the closer, the better.