How amiable are thy tabernacles - In this plural noun he appears to include all the places in or near the temple where acts of Divine worship were performed. The holy of holies, the holy place, the altar of incense, the altar of burnt-offering, etc., etc.; all called here God's tabernacles or dwelling-places; for wherever God was worshipped, there he was supposed to dwell.
How amiable - How much to he loved; how lovely. The word amiable is now used to denote a quality of mind or disposition - as gentle, affectionate, kind. The word used here, however in the original, means rather dear, beloved - as a token of endearment. Compare the notes at the title to Matthew 21:12, following.
O Lord of hosts! - Yahweh of hosts; Yahweh, controlling - ruling - guiding - marshalling - all the armies of heaven and earth: compare the notes at Isaiah 1:9; notes at Psalm 24:10.