5. And righteousness shall be the belt. (185) Some translate it girdle; but as the Prophet represents Christ to us wearing, as it were, the emblems of royalty, I have rather translated it belt, which is also a royal emblem, in the same manner as the scepter, which he had assigned to him a little before. When Job speaks of taking away the authority of kings, he says that the Lord will ungird their belt. (Job 12:18.) To be girded with a belt, therefore, is nothing else than to be exalted to royal authority, as we shall afterwards see in another passage. (Isaiah 14:5.)
The Prophet describes two ornaments belonging to the belt. These are righteousness and truth; unless it be thought that there is a change in the order of construction, as if he had said that Christ will be girded with true righteousness; for truth is not added as if it were different from righteousness, but in order to point out the nature of that righteousness with which Christ is girded. Some think that righteousness here denotes that which Christ imparts to us, that it may dwell, not only in himself, but in his members. Faith or truth they understand to be that by which we embrace the salvation which he offers to us.
The Chaldee paraphrast explains it thus; “and the righteous shall be round about him, believing worshippers shall approach to him.” (186) But I adopt a more simple interpretation, as if he had said, “He shall not appear like kings, clothed with purple and a crown, or girded with a belt; but righteousness and truth shall shine forth in him.” I acknowledge, indeed, that righteousness is not confined to Christ, but belongs to his members; but we must attend to the mode of expression, that Christ comes forth to govern his people girded with righteousness, which he afterwards imparts to them by the secret influence of the Spirit. If we distinguish between the word אמונה ( emunah) and righteousness, I consider it to mean faithfulness or steadfastness; as if he had said that Christ never disappoints his followers, for he continues always to be like himself.
(185) The girdle. — Eng. Ver.
(186) “The Targum of Jonathan renders it, and the righteous shall be round about him; that is, ‘they shall cleave to him like a girdle.’” — Jarchi.