A.T. Robertson Commentary John 5:34

"But the witness which I receive is not from man: howbeit I say these things, that ye may be saved." — John 5:34 (ASV)

But the witness which I receive (Εγω δε ου την μαρτυριαν λαμβανω). "But I do not receive the witness" simply from a man (like John). The εγω (I) in sharp contrast with υμεις (ye) of verse 33. Jesus complained of Nicodemus for not accepting his witness (3:11). Cf. also 3:32. In 1 John 5:9 the witness of God is greater than that of men and this Jesus has.

That ye may be saved (ινα υμεις σωθητε). Final clause with ινα and first aorist passive subjunctive of σωζω. This was the purpose of Christ's coming, that the world might be saved (3:17).