Is it the endrun for Jeshurun?
Deuteronomy 32:15 KJV
But Jeshurun waxed fat, and kicked: thou art waxen fat, thou art grown thick, thou art covered with fatness ; then he forsook God which made him, and lightly esteemed the Rock of his salvation.
Jeshurun or Israel has forsaken God, not by ignoring him, but by ignoring his Son. In their hubris they believe they are allowed to approach God the Father directly. Deuteronomy 32:18 KJV
Of the Rock that begat thee thou art unmindful, and hast forgotten God that formed thee.
1 Timothy 2:5-6 KJV For there is one God, and one mediator between God and men, the man Christ Jesus;  Who gave himself a ransom for all, to be testified in due time.
He is the scepter extended to Jew and Gentile alike. If one would live they must accept him. John 3:16
If they recognize him, the men of Israel can move out of their shame which they have confused with righteousness and uncover their head when they pray. 1 Corinthians 11:4 KJV
Every man praying or prophesying, having his head covered, dishonoureth his head.
You can’t run around our Rock, Jesus, to get to Jehovah. And you can’t get to Heaven relying on your Culture (fatness).
Matthew 23:8 KJV
But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren.