Jehovah who guards the sojourner, [and upholds] the orphan and the widow. Ps 146:7-9.

In Jeremiah,

Do not defraud the sojourner, the orphan, and the widow. Jer 22:3.

In Ezekiel,

In you they have dealt with the sojourner by means of acts of oppression; in you they have defrauded the orphan and the widow. Ezek 22:6, 7.

In Moses,

Do not turn aside the judgement of the sojourner, the orphan, and the widow. Deut 24:17; 27:19.

In the same author,

What remains in fields, olivegroves, and vineyards shall be for the sojourner, the orphan, and the widow. Deut 24:19-22; 26:12, 13.

In the same author,

Jehovah executes judgement for the orphan and the widow, and loves the sojourner. Deut 10:18.

The three are similarly mentioned together in the present chapter,

A sojourner you shall not afflict and shall not oppress; any widow or orphan you shall not afflict.

When these three are mentioned together in this way they present for the angels a single meaning, namely that among people in the Church good and truth should be joined together as true order requires; that is, they should be joined in a reciprocal manner - truth to good, and good to truth. For the sojourner is used to mean those who wish to receive instruction in things of the Church, widows to mean good joined to truth, and orphans truth joined to good; that is, they are joined together in a reciprocal manner. It is similar with all other things mentioned in the Word. When the internal sense of those things is explained they seem to be diffuse; but with the angels they combine and present one entire meaning, indeed one complete idea.