Psalms 81:6

"He turned away from burdens his back." Who "turned away from burdens his back," but He that cried, "Come unto Me, all ye that labour and are heavy laden"? In another manner this same thing is signified. What the pursuit of the Egyptians did, the same thing do the burdens of sins. As if thou shouldest say, From what burdens? "His hands in the basket did serve." By the basket are signified servile works; to cleanse, to manure, to carry earth, is done with a basket, such works are servile: because "every one that doeth sin, is the slave of sin;" and "if the Son shall have made you free, then will ye be free indeed." Justly also are the rejected things of the world counted as baskets, but even baskets did God fill with morsels; "Twelve baskets" did He fill with morsels; because "He chose the rejected things of this world to confound the things that were mighty." But also when with the basket Joseph did serve, he then carried earth, because he did make bricks. "His hands in the basket did serve."

And immediately there follows: He turned his back away from burdens. When we were in Egypt, we were building the cities of Pharaoh, we were carrying mud and brick, and our whole soul was seeking straw. We had no wheat, we had no heavenly bread that comes down from heaven: we were not yet receiving manna from heaven, the serpent had not yet been lifted up for us in the wilderness, the rock had not yet sent us water, we were not yet stretching out our hands and Amalek falling. We sat in the mud, and we did Egyptian works, we were building the cities of Pharaoh. He turned his back away from burdens. How great were the burdens we once had. Therefore our Moses says: 'Come to me, all you who are laden with sins, and I will refresh you.' His hands served in the basket. Whose? Israel's. The baskets of Egypt are one thing, and the baskets of Jesus another. Jesus too has his own baskets, and our Savior filled twelve baskets from the fragments. O wondrous thing, signifying immense mysteries! Five thousand of the people were dwelling in the wilderness, apart from the little ones and the women; in a deserted place there are found only as many as five loaves; for the place was a desert. I ask you, you who follow only the letter: in a deserted place there are found only five loaves — and how are twelve baskets found? If the place was a desert, surely it could not have twelve baskets. But all this is signified: that the Lord led his people out of Egypt into the desert of this world; he fed them with his loaves, and whatever was left over he stored up in twelve baskets — that is, in the twelve apostles; so that what had perished in the twelve tribes might be saved in the twelve apostles.