Psalms 80:19

Turn us again, O Lord God of hosts
This is a repetition of ( Psalms 80:3 Psalms 80:7 ) , in which may be observed an increase of the names or titles of the Divine Being: in ( Psalms 80:3 ) , it is only "O God"; in ( Psalms 80:7 ) "O God of hosts"; and here, "Lord God of hosts"; some have thought that the doctrine of the Trinity is here suggested; which is a better thought than that of Jarchi's, who supposes that three captivities of Israel are pointed at: but as it follows,

cause thy face to shine, and we shall be saved;
it appears that this was the burden of their song, being in darkness and distress, that they might have the light of God's countenance, and therefore repeat it again and again.