Or when saw we thee sick, or in prison, and came unto thee?

People's New Testament

25:37-39 Then shall the righteous answer him, etc. The saints in all ages, in lands unknown when Christ was on earth, saints who had never seen him when he was in the flesh, he commends for feeding, visiting and entertaining him whom they had never seen in person. What more natural than for them to exclaim: When saw we thee? When did we entertain thee ? etc.

Matthew Henry's Concise Commentary

25:31-46 This is a description of the last judgment. It is as an explanation of the former parables. There is a judgment to come, in which every man shall be sentenced to a state of everlasting happiness, or misery. Christ shall come, not only in the glory of his Father, but in his own glory, as Mediator. The wicked and godly here dwell together, in the same cities, churches, families, and are not always to be known the one from the other; such are the weaknesses of saints, such the hypocrisies of sinners; and death takes both: but in that day they will be parted for ever. Jesus Christ is the great Shepherd; he will shortly distinguish between those that are his, and those that are not. All other distinctions will be done away; but the great one between saints and sinners, holy and unholy, will remain for ever. The happiness the saints shall possess is very great. It is a kingdom; the most valuable possession on earth; yet this is but a faint resemblance of the blessed state of the saints in heaven. It is a kingdom prepared. The Father provided it for them in the greatness of his wisdom and power; the Son purchased it for them; and the blessed Spirit, in preparing them for the kingdom, is preparing it for them. It is prepared for them: it is in all points adapted to the new nature of a sanctified soul. It is prepared from the foundation of the world. This happiness was for the saints, and they for it, from all eternity. They shall come and inherit it. What we inherit is not got by ourselves. It is God that makes heirs of heaven. We are not to suppose that acts of bounty will entitle to eternal happiness. Good works done for God's sake, through Jesus Christ, are here noticed as marking the character of believers made holy by the Spirit of Christ, and as the effects of grace bestowed on those who do them. The wicked in this world were often called to come to Christ for life and rest, but they turned from his calls; and justly are those bid to depart from Christ, that would not come to him. Condemned sinners will in vain offer excuses. The punishment of the wicked will be an everlasting punishment; their state cannot be altered. Thus life and death, good and evil, the blessing and the curse, are set before us, that we may choose our way, and as our way so shall our end be.