Verses with the word jeshurun in the Old Testament (3 verses):

Deuteronomy 32:15
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.

Deuteronomy 33:5
And he was king in Jeshurun, when the heads of the people and the tribes of Israel were gathered together.

Deuteronomy 33:26
There is none like unto the God of Jeshurun, who rideth upon the heaven in thy help, and in his excellency on the sky.