G. R. S. Mead 
The Hymn of the Robe of Glory, The Hymns of Hermes [EPUB ebook] 

8
They girt me with Adamant [also]
That hath power to cut even iron.
9
My Glorious Robe they took off me
Which in their love they had wrought me,
10
And my Purple Mantle [also]
Which was woven to match with my stature.
11
And with me They [then] made a compact;
In my heart wrote it, not to forget it:
12
‘If thou goest down into Egypt,
And thence thou bring’st the one Pearl–
13
‘[The Pearl] that lies in the Sea,
Hard by the loud-breathing Serpent, —
14
‘[Then] shalt Thou put on thy Robe
And thy Mantle that goeth upon it,
15
‘And with thy Brother, Our Second,
Shalt thou be Heir in our Kingdom.’