'Writing' in the Bible

'Men, brethren, it behoved this Writing that it be fulfilled that beforehand the Holy Spirit spake through the mouth of David, concerning Judas, who became guide to those who took Jesus,

And the contents of the Writing that he was reading was this: 'As a sheep unto slaughter he was led, and as a lamb before his shearer dumb, so he doth not open his mouth;

and Philip having opened his mouth, and having begun from this Writing, proclaimed good news to him -- Jesus.