He said to them, "You will drink my cup, but to sit at my right hand and at my left is not mine to grant, but it is for those for whom it has been prepared by my Father."
Matthew 20:23

This is one of many verses that plainly say that the Son is subordinate to the Father. I have no problem with the idea of the Trinity (I am more-or-less in agreement), but I find it hard to believe that the people who came up with the "co-equal" part got it from the Bible.