Charles Ellicott Commentary Psalms 68:26

"Bless ye God in the congregations, Even the Lord, [ye that are] of the fountain of Israel." — Psalms 68:26 (ASV)

Bless you. —Apparently these words are part of the processional hymn. But in Judges 5:9 a similar outburst of praise appears to come from the poet.

From the fountain of Israel. —A comparison with Isaiah 48:1; Isaiah 51:1, certainly allows us to understand this in the congregations sprung from the head waters (as we say) of the races, i.e., the patriarchal ancestors. At the same time if there were any mode of taking the words literally instead of figuratively it would be preferable.