How do we care for the least of these?

By loving the stranger:

For the Lord your God is God of gods, and Lord of lords, a great God, a mighty, and a terrible, which regardeth not persons, nor taketh reward: He doth execute the judgment of the fatherless and widow, and loveth the stranger, in giving him food and raiment. Love ye therefore the stranger: for ye were strangers in the land of Egypt. Deuteronomy 10:17-19

By giving of our increase to feed the stranger, the fatherless, the widow and the full time ministers of the Lord:

At the end of three years thou shalt bring forth all the tithe of thine increase the same year, and shalt lay it up within thy gates: And the Levite, (because he hath no part nor inheritance with thee,) and the stranger, and the fatherless, and the widow, which are within thy gates, shall come, and shall eat and be satisfied; that the Lord thy God may bless thee in all the work of thine hand which thou doest. Deuteronomy 14:28-29

By treating them justly and sharing our increase with them, remembering that we were once in bondage:

Thou shalt not pervert the judgment of the stranger, nor of the fatherless; nor take a widow's raiment to pledge: But thou shalt remember that thou wast a bondman in Egypt, and the Lord thy God redeemed thee thence: therefore I command thee to do this thing. When thou cuttest down thine harvest in thy field, and hast forgot a sheaf in the field, thou shalt not go again to fetch it: it shall be for the stranger, for the fatherless, and for the widow: that the Lord thy God may bless thee in all the work of thine hands. When thou beatest thine olive tree, thou shalt not go over the boughs again: it shall be for the stranger, for the fatherless, and for the widow. When thou gatherest the grapes of thy vineyard, thou shalt not glean it afterward: it shall be for the stranger, for the fatherless, and for the widow. And thou shalt remember that thou wast a bondman in the land of Egypt: therefore I command thee to do this thing. Deuteronomy 24:17-22

By defending them, delivering and rescuing the poor, afflicted and needy:

Defend the poor and fatherless: do justice to the afflicted and needy. Deliver the poor and needy: rid them out of the hand of the wicked. Psalm 82:3-4

By relieving them and advocating for them:

Learn to do well; seek judgment, relieve the oppressed, judge the fatherless, plead for the widow. Isaiah 1:17

By sharing our bread with the hungry, bringing the homeless into our homes, and covering the naked:

Is it not to deal thy bread to the hungry, and that thou bring the poor that are cast out to thy house? when thou seest the naked, that thou cover him; and that thou hide not thyself from thine own flesh? Isaiah 58:7 By showing mercy and compassion to them:

Thus speaketh the Lord of hosts, saying, Execute true judgment, and shew mercy and compassions every man to his brother: And oppress not the widow, nor the fatherless, the stranger, nor the poor; and let none of you imagine evil against his brother in your heart. Zechariah 7:9-10

By visiting them in their affliction:

Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world. James 1:27