Literally, it stands written. This form of the phrase, the participle with the substantive verb, is peculiar to John in place of the more common γέγραπται. For a similar construction see Joh 3:21.
The zeal of thine house
Jealousy for the honor of God's house. Zeal, ζῆλος, from ζέω, to boil. See on Jam 3:14.
Hath eaten me up (κατέφαγέ με)
So the Sept., Psalms 68 (A.V., Psa 69:9). But the best texts read καταφάγεται, shall eat up. So Rev., Wyc., “The fervor of love of thine house hath eaten me.”