The phrase "slept with his ancestors" is a euphemism for dying. Alternate translation: "Asa died during" (See: [[rc://en/ta/man/translate/figs-euphemism]])
"in year 41 of his reign" or "when he reigned almost 41 years" (See: [[rc://en/ta/man/translate/translate-ordinal]] and [[rc://en/ta/man/translate/translate-numbers]])