# his house
This is referring to Daniel's house.
# what had happened
"about the king's decree"
# He urged them to seek mercy
"He begged them to pray for mercy"
# so that he and they might not be killed
This can be stated in active form. AT: "so that the king would not kill them" or "so that the king's bodyguard would not kill them" (See: [[rc://en/ta/man/translate/figs-activepassive]])