The LORD is the portion of mine inheritance and of my cup: thou maintainest my lot.
The Lord is the portion of mine inheritance - (Lamentations 3:24.) The image is from the tribe of Levi and Aaron the high priest, to whom the Lord spake, Numbers 18:20, "Thou shalt have no inheritance in their land; neither shalt thou have any part among them. I am thy part and thine inheritance among the children of Israel," etc. So the true Israelites feel the Lord to be their inheritance, whether they have more or less of this world's goods. Christ, the Antitype, in the fullest sense, made 'the Lord His portion:' as the second Adam, He resumed that standing of implicit trust in Yahweh as His all, from which the first Adam fell, beguiled by the illusory promises of another inheritance held out by the father of lies.
And of my cup. Image from a sumptuous feast (Psalms 23:5).
Thou maintainest my lot, х towmiyk (H8551)] - thou wilt not suffer any one to dispossess me of this my lot. Not like earthly possessions, from which the lawful owner is often dislodged. The Hebrew means to prop one up, sustain, so as not to fall, as Aaron and Hur propped up Moses' hands (Exodus 17:12; cf. Psalms 41:12; Psalms 63:8; Psalms 125:3). Satan cannot, by force or fraud, deprive the saints of their lot, once they have obtained it-grace here and glory hereafter (John 10:28-29).