Contradiction with Matthew 5:34
Jesus advises against swearing oaths at all, whereas Isaiah 62:8 depicts the Lord swearing by His strong arm.
Matthew 5:34: But I say unto you, Swear not at all; neither by heaven; for it is God's throne:
Contradiction with James 5:12
James advises against swearing, encouraging simple yes or no, contradicting God's oath in Isaiah 62:8.
James 5:12: But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and [your] nay, nay; lest ye fall into condemnation.
Contradiction with Matthew 26:52
This verse suggests living by the sword leads to perishing by it, opposing the idea of divine defense in Isaiah 62:8.
Matthew 26:52: Thinkest thou that I cannot now pray to my Father, and he shall presently give me more than twelve legions of angels?
Contradiction with Hebrews 6:13
It describes God's promise to Abraham, swearing by Himself, suggesting a unique instance, unlike the repetition implied in Isaiah 62:8.
Hebrews 6:13: For when God made promise to Abraham, because he could swear by no greater, he sware by himself,
Contradiction with Romans 12:19
Advises against taking vengeance, leaving it to God, but Isaiah 62:8 implies divine responsibility for a community's protection.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.