"and our toil": the children, viz. (Shemoth 1:22) "Every son that is born, into the Nile shall you throw him, and every daughter shall you keep alive."
"and our lachatz": This is oppression, viz. (Shemoth 3:9): "and I have also seen the oppression wherewith the Egyptians oppress them."
(Devarim, Ibid. 8) "And the L-rd took us out": not through an angel, and not through a seraph, and not through a messenger, as it is written (Shemoth 12:12) "And I shall pass through the land of Egypt in this night, and I shall smite, etc.": "And I shall pass through the land of Egypt" — I, and not an angel. "and I shall smite every first-born" — I, and not a seraph. "and upon all the gods of Egypt I shall wreak judgments" — I, and not a messenger, "I am the L-rd."