While you wait for your friends in the weirdly empty shive, you do that. The thing about legal rulings is that they're not entirely ordered by subject. It could be in the tractate on Sabbatz, the very new tractates dealing with angelic communications, or any one of the sixty-four other tractates during one of the ravs' frequent tangents. You go get a volume of the legal concordance, which indexes every significant word used in the commentaries. Or at least the ones that were complete when this was printed.
You could just ask the angels where the word "quest" appears in the commentaries, but that feels kind of like cheating. Also, it could be mentioned as an "errand," "order," "request," or basically anything else. So many possibilities!! You freaking love the legal commentaries.