Ninety Amens Leading to Life in Olam Haba

“ינצרהו מן ואמת חסד אלקים לפני עולם ישב” (ח סא)

The words “ve’emes mann” allude to the obligation to answer ninety amens a day, because amen means emes, truth, and the word מן is numerically equivalent to 90. The passuk is saying that Hashem did chessed with a person that in the merit of him being strict to answer ninety amens a day, he will merit that “yintzeruhu” from Above from all bad things, both in this world and in the World to Come, and this way, he will merit to see the words “Yeshev olam lifnei Elokim” be fulfilled. (Minchas Yosef, Vol. II, Introduction)