Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "délan." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 198.
.Dele, and for the passage substitute :-- Ǽr þon engla wearð (weard, MS.) for oferhygde dǽl on gedwilde; noldan dreógan leng heora selfra rǽd ere of the angels part from pride fell into error; they would not longer do what was best for themselves, Gen. 23.