125 Questions prefaced with μή (mē) in Greek anticipate a negative answer. This can sometimes be indicated by using a “tag” at the end in English (here it is “can he?”).
126 The picture of a blind man leading a blind man is a warning to watch who one follows: Won’t they both fall into a pit? The sermon has been about religious choices and reacting graciously to those who oppose the followers of Jesus. Here Jesus’ point was to be careful who you follow and where they are taking you.

In other versions

He also told them a parable: “Can a blind man lead a blind man? Will they not both fall into a pit?

He also told them this parable: “Can the blind lead the blind? Will they not both fall into a pit?

He also told them a parable: “Can the blind guide the blind? Won’t they both fall into a pit?

Then Jesus gave the following illustration: “Can one blind person lead another? Won’t they both fall into a ditch?

And he also told them a parable: “Surely a blind person cannot lead the blind, can he? Will they not both fall into a pit?

And he spake a parable unto them, Can the blind lead the blind? shall they not both fall into the ditch?

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