Psalm 68:10 ASV

The Psalmist is worshipping God for the great things He has done - defending the defenseless, setting the lonely in families, freeing prisoners. This includes natural provision - abundant showers that made the land bounteous - which provided for the poor.

This passage shows God's capacity to intervene, and ability to provide - but is certainly not a universal promise of provision. In fact, is seems more like a retrospective, seeing the good things that God did in the past and identifying them as God's provision.