大方廣佛華嚴經入法界品四十二字觀門 1.22

1.22

惹字時，入世間流轉窮源清淨般若波羅蜜門，悟一切法能所生起不可得故。

When pronouncing the letter JA, one enters the perfection of wisdom door of purifying the deep origin of worldly transmigration, because one realizes that the producer and produced (jāti) of all dharmas cannot be apprehended.