The Story of Grettir the Strong, by William Morris  Chap. xxxv.
Grettir goes to Thorhall-stead, and has to do with Glam.
Grettir rode to Thorhall-stead, and the bonder gave him good
welcome; he asked whither Grettir was minded to fare, but
Grettir said he would be there that night if the bonder would
have it so.  Thorhall said that he thanked him therefor, "But
few have thought it a treat to guest here for any time; thou
must needs have heard what is going on here, and I fain would
that thou shouldest have no trouble from me: but though thou
shouldest come off whole thyself, that know I for sure, that
thou wilt lose thy horse, for none keeps his horse whole who
comes here."  Grettir said that horses were to be had in plenty
whatsoever might hap to this. Then Thorhall was glad that
Grettir was to be there, and gave him a hearty welcome.  Now
Grettir's horse was locked up in a strong house, and they went
to sleep; and so the night slipped by, and Glam came not home.
Then said Thorhall, "Things have gone well