Let us not rend it - It would then have been useless. The outer garment, being composed of several parts - fringes, borders, etc. Deuteronomy 12:12 - could be easily divided.
That the scripture ... - Psalms 22:18.
Related Commentaries of John 19:24
John 19:24
24 They said therefore among themselves, Let us not rend it, but cast lots for it, whose it shall be: that the scripture might be fulfilled, which saith, They parted my raiment among them, and for my vesture they did cast lots. These things therefore the soldiers did.