“Jesus said to them.
And marries another,
καὶ λέγει αὐτοῖς Ὃς ἂν ἀπολύσῃ τὴν γυναῖκα αὐτοῦ καὶ γαμήσῃ ἄλλην, μοιχᾶται ἐπ’ αὐτήν·
This response of Jesus to his disciples can be found also in Matthew, chapter 19:9, where there was also an emphasis on divorce as adultery. Mark indicated that Jesus said to his disciples (καὶ λέγει αὐτοῖς) that whoever divorced his wife (Ὃς ἂν ἀπολύσῃ τὴν γυναῖκα αὐτοῦ) and married another woman (καὶ γαμήσῃ ἄλλην), committed adultery against her (μοιχᾶται ἐπ’ αὐτήν). Jesus had taken the stronger stance of no divorce. However, here there was no exception about sexual misconduct compared to Matthew.
Said to them.
‘Because of your hardness
ὁ δὲ Ἰησοῦς εἶπεν αὐτοῖς Πρὸς τὴν σκληροκαρδίαν ὑμῶν ἔγραψεν ὑμῖν τὴν ἐντολὴν ταύτην.
This response of Jesus about divorce can also be found in Matthew, chapter 19:8. Jesus responded to the Pharisees (ὁ δὲ Ἰησοῦς εἶπεν αὐτοῖς). He said that Moses allowed them to divorce their wives, because they were so hard-hearted, perverse, and obstinate (Πρὸς τὴν σκληροκαρδίαν ὑμῶν). Moses wrote this ordinance or commandment for them (ἔγραψεν ὑμῖν τὴν ἐντολὴν ταύτην). Jesus had taken the stronger stance of no divorce. However, in Matthew, there was one exception for divorce, the sexual misconduct of the wife. Here in Mark, there is no exception, no divorce.