Passage
and he saith to them, `Whoever may put away his wife, and may marry another, doth commit adultery against her;
and he saith to them, `Whoever may put away his wife, and may marry another, doth commit adultery against her;
Mark 10:9 what therefore God did join together, let not man put asunder.'
Mark 10:10 And in the house again his disciples of the same thing questioned him,
Mark 10:11 and he saith to them, `Whoever may put away his wife, and may marry another, doth commit adultery against her;
Mark 10:12 and if a woman may put away her husband, and is married to another, she committeth adultery.'
Mark 10:13 And they were bringing to him children, that he might touch them, and the disciples were rebuking those bringing them,
The verse centers on "saith", "whoever", "away", "wife", "marry", "another", "doth", and "commit". It is saying that the verse draws attention to "saith" and "whoever", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "And in the house again his disciples..." into verse 12's "and if a woman may put away...", so "saith" and "whoever" belong inside that flow. In Mark context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "saith" and "whoever" with trust shaped by these words, not by a vague optimism outside the passage.