John Gill Commentary Psalms 36:8

"They shall be abundantly satisfied with the fatness of thy house; And thou wilt make them drink of the river of thy pleasures." — Psalms 36:8 (ASV)

They shall be abundantly sallied with the fatness of your
house
By his "house" is meant the church of God, of his building, and where he dwells; by the fatness of it the provisions there, the word and ordinances, and the blessings of grace which they hold forth; and especially Christ, the fatted calf, the bread of life, whose flesh is meat indeed, and whose blood is drink indeed, and which make a feast of fat things; and these they that trust in the Lord are welcome to eat and drink of abundantly, and to abundant satisfaction; see (Matthew 5:6) (Psalms 22:26) ;

and you shall make them drink of the river of your pleasure ;
the love of God, whose streams make glad the city of God; or the fulness of grace, which is in Christ, out of which believers draw with joy, and drink with pleasure; or eternal glory and happiness, enjoyed in the presence of God, in which is fulness of joy, and at whose right hand are pleasures for evermore; a never ceasing torrent of them.