Contradiction with Proverbs 20:29
Genesis 27:1 mentions Isaac's failing eyesight and old age, suggesting weakness, while Proverbs 20:29 states that the beauty of old men is the grey head, highlighting respect and honor in old age.
Proverbs 20:29: The glory of young men [is] their strength: and the beauty of old men [is] the gray head.
Contradiction with Ecclesiastes 12:1
Genesis 27:1 focuses on Isaac's diminished senses as he ages, whereas Ecclesiastes 12:1 advises remembering God in youth before the difficult days come, implicitly suggesting a vibrant early life contrasted with tougher old age.
Ecclesiastes 12:1: Remember now thy Creator in the days of thy youth, while the evil days come not, nor the years draw nigh, when thou shalt say, I have no pleasure in them;
Contradiction with Isaiah 40:31
Genesis 27:1 depicts Isaac's physical decline, whereas Isaiah 40:31 talks about those who wait on the Lord renewing their strength and not growing weary, suggesting a divine restoration of strength.
Isaiah 40:31: But they that wait upon the LORD shall renew [their] strength; they shall mount up with wings as eagles; they shall run, and not be weary; [and] they shall walk, and not faint. [renew: Heb. change]