The Passover of the Jews was at hand, and Jesus went up to Jerusalem.
The passover of the Jews ... Writing near the end of the first century, John no longer referred to the passover as a feast of God, but of the "Jews".  Whatever ordinances or observances are undertaken upon man's initiative only, such ordinances, even though originally commanded by God, become in a special sense the ordinances of men.  Jesus' saying of the temple, "Behold your house is left unto you desolate"  (Matthew 23:38), is in the same vein of thought.