Why must He be a true and righteous man?

He must be a true man because the justice of God requires that the same human nature which has sinned should pay for sin. He must be a righteous man because one who himself is a sinner cannot pay for others.

Scripture proofs King James Version

Rom: 5:12, 15 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: ... But not as the offence, so also is the free gift. For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many.
I Cor. 15:21 For since by man came death, by man came also the resurrection of the dead.
Heb. 2:14-16 Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil; And deliver them who through fear of death were all their lifetime subject to bondage. For verily he took not on him the nature of angels; but he took on him the seed of Abraham.
Heb. 7:26, 27 For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens; Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people’s: for this he did once, when he offered up himself.
I Pet. 3:18 For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:

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Edition & Source Public domain

Source: The Heidelberg Catechism
Translation: English translation as published by apuritansmind.com; Scripture proofs: King James Version
Published: First published 1563
Original URL: apuritansmind.com/creeds-and-confessions/the-heidelberg-catechism-by-zacharias-ursinus/
Copyright: Public domain.
License: Public domain
Attribution: Public domain. Text transcribed from apuritansmind.com, which reformed.org's historic-documents index links to. Compared automatically with the PDF at heidelberg-catechism.com, which is the same translation family: 217 of 258 questions and answers matched. Of the 41 that did not, I checked 18 by hand: Q12, Q18, Q27, Q56 and Q61 differ in wording, and the others were page-layout noise in the PDF; the remaining 23 were not checked by hand. Not yet proofread against a printed edition. Part divisions are the standard ones (Q1–2 introduction; Q3–11 misery; Q12–85 deliverance; Q86–129 thankfulness). The question 23 creed text had verse-number markers removed. Scripture proof texts are the King James Version, from the public-domain Project Gutenberg edition, added with tools/add_kjv.py. A few references could not be matched to verses (whole-chapter references such as ‘Genesis 1 throughout’, and typing slips in the source) and are shown without text.

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Cite as The Heidelberg Catechism. First published 1563. https://www.apuritansmind.com/creeds-and-confessions/the-heidelberg-catechism-by-zacharias-ursinus/