Quran 75:14

In fact man is a witness against himself,

Indeed, man is a witness to himself,

In fact, man himself is keeping an eye on his state of affairs!

nay, man shall be a clear proof against himself,

Nay! [The] man against himself (will be) a witness.

Aye! man against himself shall be an enlightenment.

Nay! Man will be a witness against himself [as his body parts (skin, hands, legs, etc.) will speak about his deeds].

But lo, man is well aware of himself,

In fact, people are well-aware of their own soul

Nay! man is evidence against himself,

Oh, but man is a telling witness against himself,

He shall be a clear proof against himself,

Rather, man, against himself, will be a witness,

And man will be evidence against himself.

Indeed, man shall be a witness against himself,

Nay, man will be evidence against himself,