The Lord said, I will bring again from {q} Bashan, I will bring my people again from the depths of the sea:

(q) As he delivered his Church once from Og of Bashan and other tyrants and from the danger of the Red Sea, so will he still do as often as it is necessary.

Wesley's Notes

68:22 Bring again - I will give my people as great deliverances as I formerly did, when I saved them from Og, king of Bashan. The sea - From the Egyptians at the Red Sea.

Jamieson-Fausset-Brown Bible Commentary

22. Former examples of God's deliverance are generalized: as He has done, so He will do.

from Bashan-the farthest region; and-

depths of the sea-the severest afflictions. Out of all, God will bring them. The figures of Ps 68:23 denote the completeness of the conquest, not implying any savage cruelty (compare 2Ki 9:36; Isa 63:1-6; Jer 15:3).

Matthew Henry's Concise Commentary

68:22-28 The victories with which God blessed David over the enemies of Israel, are types of Christ's victory, for himself and for all believers. Those who take him for theirs, may see him acting as their God, as their King, for their good, and in answer to their prayers; especially in and by his word and ordinances. The kingdom of the Messiah shall be submitted to by all the rulers and learned in the world. The people seem to address the king, ver. 28. But the words are applicable to the Redeemer, to his church, and every true believer. We pray, that thou, O God the Son, wilt complete thine undertaking for us, by finishing thy good work in us.