I blogged about looking up Philo citations in BDAG awhile back. But Philo (and even Josephus) aren’t the only potential targets you can work with.
There are a number of reasons to use pseudepigraphal writings (Greek or English or both) to supplement one’s study, though I think such reasons fall into two primary categores: cultural and linguistic. In this article I’ll focus a bit on the linguistic side of things (though I do venture into the cultural a bit), looking particularly at word meanings.
In my personal study, I like to look up cross-references when looking into word meanings. This is particularly handy if a word doesn’t occur often in the New Testament but does occur in other non-canonical writings. I was recently looking at 1Ti 3.8, specifically at the word ?????????????, which the ESV translates as greedy for dishonest gain.
The first thing, of course, was to look it up in BDAG. Here I found that it occurs 2 times in the NT, and both of these are in the Pastoral Epistles (1Ti 3.8 and Tt 1.7). Both contexts are the pretty much the same. But BDAG also cites instances of ????????????? in the Works of Philo (Sacr. Abel. 32) and in the pseudepigraphal Testament of Judah 16.1.