Sæmund’s Edda (Thorpe’s tr.).
To keep this instrument, which was a symbol of the crescent moon, ever at hand, Heimdall either hung it on a branch of Yggdrasil above his head or sank it in the waters of Mimir’s well. In the latter it lay side by side with Odin’s eye, which was an emblem of the moon at its full.
Heimdall
Dorothy Hardy
Heimdall’s palace, called Himinbiorg, was situated on the highest point of the bridge, and here the gods often visited him to quaff the delicious mead which he set before them.
“’Tis Himminbjorg called
Where Heimdal, they say,
Hath dwelling and rule.
There the gods’ warder drinks,