John 5:47

⁴⁵ Do not think that I will accuse you to the Father: there is one that accuseth you, even Moses, in whom ye trust.

⁴⁶ For had ye believed Moses, ye would have believed me: for he wrote of me.

But if ye believe not his writings, how shall ye believe my words?

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: But since you do not believe what he wrote, how will you believe what I say?”
KJV: But if ye believe not his writings, how shall ye believe my words?
WEB: But if you don’t believe his writings, how will you believe my words?”
ASV: But if ye believe not his writings, how shall ye believe my words?
DARBY: But if ye do not believe his writings, how shall ye believe my words?
BLB: But if you⁺ do not believe his writings, how will you⁺ believe My words?”

ÅB: men tror dere ikke hans skrifter, hvordan kan dere da tro mine ord?
OTB: Men hvis dere ikke tror det han skrev, hvordan skal dere da stole på det jeg sier?
B1930: men tror I ikke hans skrifter, hvorledes kan I da tro mine ord?

Luke 16:31
And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead.
Read in context
Luke 16:29
Abraham saith unto him, They have Moses and the prophets; let them hear them.
Read in context