Psalms 121:5

“The Lord is thy keeper - Thy Preserver; thy Defender. He will keep time from danger; he will keep thee from sin; he will keep thee unto salvation. The Lord is thy shade - The Lord is as a shadow: as the shadow of a rock, a house, or a tree, in the intense rays of the burning sun. See the notes at Isaiah 25:4. Upon thy right hand - See Psalms 16:8; Psalms 109:31. Perhaps the particular allusion to the right hand here may be that that was the place of a protector. He would thus be at hand, or would be ready to interpose in defense of him whom he was to guard. It is possible, however, that the idea here may be derived from the fact that in Scripture the geographer is represented as looking to…”

“Shade - To keep thee from the burning heat of the sun. Psalms 121:6”

“thy shade: Exo 13:21; Isa 4:5, Isa 4:6, Isa 25:4, Isa 32:2; Mat 23:37 upon: Psa 16:8, Psa 109:31 Psalms 121:6”

“That which holds good of "the Keeper of Israel" the poet applies believingly to himself, the individual among God's people, in Psa 121:5 after Gen 28:15. Jahve is his Keeper, He is his shade upon his right hand (היּמין as in Jdg 20:16; Sa2 20:9, and frequently; the construct state instead of an apposition, cf. e.g., Arab. jânbu 'l-grbı̂yi, the side of the western = the western side), which protecting him and keeping him fresh and cool, covers him from the sun's burning heat. על, as in Psa 109:6; Psa 110:5, with the idea of an overshadowing that screens and spreads itself out over anything (cf. Num 14:9). To the figure of the shadow is appended the consolation in Psa 121:6. הכּה of the sun…”