Scriptural Passages

James Blish, like Poul Anderson (see here and here), refers to the Bible (see here).

Also:

"...And a river went out of Eden to water the garden..." (etc)
-James Blish, The Night Shapes (London, 1965), III, pp. 44-45.

I think that there is a concealed Biblical reference in Mission To The Heart Stars. Thus:

"He is the disciple who spoke of these things, the one who also wrote them down; and we know that what he said is true."
-John, 21. 24.

And:

"...one of the speakers was Hesperus...It is certain, because he has told us so...because it is he that tells us, we know it to be true..."
-James Blish, Mission To The Heart Stars (London, 1980), CHAPTER ELEVEN, p. 124.

Lastly, for now, Blish varies scriptural sources by quoting from the Koran Sura LVI and XXI at the beginning of The Triumph Of Time.