WATCH: President Barack Obama sings ‘Amazing Grace’ at Clementa Pinckney’s funeral

President Barack Obama delivers the eulogy Friday June 26, 2015 for slain pastor and South Carolina state Sen. Clementa Pinckney, who was one of nine people shot to death inside Emanuel AME Church in Charleston on June 17. Dylann Roof, 21,who is white, has been charged with murder in an attack authorities say was racially motivated. (Paul Zoeller/The Post and Courier)

During his eulogy, President Barack Obama talked about many things: race relations, gun violence and even the Confederat battle flag that flies on the South Carolina Statehouse grounds.

But perhaps one of the most memorable moments came at the end of his speech when he led those assembled in a verse of “Amazing Grace.”