When lincoln refers to " their bread from the sweat of other men's " he is alluding to famous lines from a. the bible. b. the us constitution. c. the gettysburg address. d. the declaration of independence?

The correct answer is a). the bible.

In his Second Inaugural Address, Lincoln pronounced the words "wringing their bread from the sweat of other men's faces" in his speech. It was an allusion to Bible, the Fall of Man in the Book of Genesis. On Genesis 3:19 it is said that as a result of Adam's sin, God tells him that henceforth "In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return".  

Abraham Lincoln Second Inauguration was on March 4, 1865. He was assassinated a month later