As it is written - Psalms 112:9. The idea is, “in this way will the saying in the Scriptures be verified, or the promise confirmed.” The psalmist is describing the character of the righteous man. One of his characteristics, he says, is, that he has scattered abroad, he has given liberally to the poor. On such a man a blessing is pronounced Psalms 112:1; and one of the blessings will be that he shall be prospered. Some difficulty has been felt by commentators to see how the quotation here made sustains the position of Paul that the liberal man would be blessed of God, and would receive an increase according to his liberality. In order to this, they have supposed (see Doddridge, Bloomfield, and Clarke) that the word “righteousness” means the same as almsgiving, or that “he would always have something to bestow.” But I would suggest that perhaps Paul quoted this, as quotations are frequently made in the Scriptures, where a passage was familiar. He quotes only a part of the passage, meaning that the whole passage confirms the point under consideration. Thus, the whole passage in the psalm is, “He hath dispersed; he hath given to the poor; his righteousness endureth forever; his horn shall be exalted with honor;” that is, he shall be abundantly blessed with prosperity and with the favor of God. Thus, the entire promise sustains the position of Paul, that the liberal man would be abundantly blessed. The phrase “he hath dispersed” Ἐσκόρπισεν Eskorpisen, may refer either to the act of sowing, as a man scatters seed on the earth; or there may be an allusion to the oriental custom of scattering money among an assembled company of paupers; compare Proverbs 11:24.
His righteousness - His deeds of beneficence.
Remaineth - In its fruits and consequences; that is, either in its effects on others, or on himself. It may mean that the sums so distributed will remain with him forever inasmuch as he will be supplied with all that is needful to enable him to do good to others. This interpretation accords with the connection.