GAL 1:14

14 And I was shtaig [(working my way up, advancing, progressing)] in Yahadut [(Judaism)] beyond many of my landsmen, being more abundantly machmir and a kannai [(zealot)] bekius for the minhagim, the Masorot haAvot, the kabbalah [(oral tradition)], the Torah Sheb'al Peh, the Halakhah of my Avot.