Jamieson, Fausset & Brown, on Ps 42:3

“Send forth thy light and thy truth: they have conducted me, and brought me unto thy holy hill, and into thy tabernacles.”

“light--as in Psa 27:1. truth--or, "faithfulness" (Psa 25:5), manifest it by fulfilling promises. Light and truth are personified as messengers who will bring him to the privileged place of worship. tabernacles--plural, in allusion to the various courts.”

Imported from an open dataset — not yet checked against the printed edition.