Martin Luther King Jr. carried a black leather King James Bible on his journeys as a young pastor starting out in Montgomery, Ala. He turned to this “traveling Bible” for inspiration, his family says, as he fought for freedom and equality.

President Obama will put his hand over King’s well-worn Bible at his public swearing-in at the U.S. Capitol on Jan. 21, the holiday celebrating the birthday of the slain civil rights leader. King’s Bible will be stacked with the burgundy velvet and gilded Bible used by President Abraham Lincoln at his first inauguration.

Obama chose the Lincoln Bible for his inauguration in 2009, making him the first president to do so since it was initially used in 1861. President Harry S. Truman also used two Bibles, as did Dwight D. Eisenhower and Richard M. Nixon.....