8 Most (א*,2 C L W 0106 33 𝔐) have an expanded introduction here; instead of “For God said,” they read “For God commanded, saying” (ὁ γὰρ θεὸς ἐνετείλατο λέγων, ho gar theos eneteilato legōn). But such expansions are generally motivated readings; in this case, most likely it was due to the wording of the previous verse (“the commandment of God”) that caused early scribes to add to the text. Although it is possible that other witnesses reduced the text to the simple εἶπεν (eipen, “[God] said”) because of perceived redundancy with the statement in v. 3, such is unlikely in light of the great variety and age of these authorities (א1 B D Θ 073 f1, 13 579 700 892 lat co, as well as other versions and fathers).
9 A quotation from Exod 20:12; Deut 5:16.
10 A quotation from Exod 21:17; Lev 20:9.

In other versions

For God commanded, ‘Honor your father and your mother,’ and, ‘Whoever reviles father or mother must surely die.’

For God said, ‘Honor your father and mother’ and ‘Anyone who curses their father or mother is to be put to death.’

For God said: Honor your father and your mother; and, Whoever speaks evil of father or mother must be put to death.

For instance, God says, ‘Honor your father and mother,’ and ‘Anyone who speaks disrespectfully of father or mother must be put to death.’

For God said, ‘Honor your father and your mother,’ and ‘The one who speaks evil of father or mother must certainly die.’

For God commanded, saying, Honour thy father and mother: and, He that curseth father or mother, let him die the death.

Public Domain