Thou, O God, didst send a plentiful rain. Not a literal rain, but a shower of blessings—manna, quails, water out of the rock, protection against enemies, victories, etc. Whereby thou didst confirm (or, establish) thine inheritance (see 2 Samuel 7:13).
When it was weary. The wandering in the wilderness must have been inexpressibly dull and wearisome, especially to those who had left Egypt with the hope of a quick march through the waste, and a speedy entrance into "a land flowing with milk and honey" (Exodus 3:17).
The "establishment" in Palestine under Joshua was a blessing that could not but be highly valued after well nigh a century of cruel bondage in Egypt, and forty years of aimless wandering in the Sinaitic peninsula.