A father of the fatherless, and a judge of the widows, is God in his holy habitation.
A father of the fatherless, and a judge of the widows, (is) God. God's compassionate love to the distressed in particular, as widows and orphans (cf. Psalms 146:7-9; Deuteronomy 10:18), is the ground of the triumphant deliverances which He vouchsafes to His people (as in the recent war with Ammon), and to His Church, represented as "a widow" (Luke 18:3; Luke 18:7). Compare Hosea 14:3. God is a "judge," to vindidicate His people's cause (Psalms 54:1), not like the unjust judge in Luke 18:1, etc.
In his holy habitation - the seat of holiness, righteousness, and faithfulness, contrasted with this earth, the seat of selfishness and unrighteousness (Psalms 11:4; Psalms 22:3).