310 Worlds for the Angels of Amen
Chazal say (Sanhedrin 100a) that "HaKadosh Baruch Hu will, in the future, give each and every tzaddik 310 worlds, as it says (Mishlei ואצרותיהם אמלא: 8:21 יש – להנחיל אהבי) the words יש is numerically equivalent to 310.
The Chofetz Chaim explained the benefit that the tzaddikim have from so many worlds:
As is known, each mitzvah a person does creates an angel. Just from being strict about meah brachos and 90 amens each day – the quota that Chazal set for us – a person creates 190 angels each day. Over the years, this will accrue to millions of angels. These angels belong to him and are at his disposal, and they protect his every step. In order for the tzaddik to be able to bask and enjoy Olam Haba with the millions of angels that were created through his mitzvos, it was promised that he would inherit 310 worlds in the future. (Chessed L’Avraham [HaRav Aharon Cohen, son-in-law of the Chofetz Chaim] Devarim Ne’imim 7).
His Reward Is Alluded to in the Stones of the Choshen
Rabbi Pinchas Sa’adon, the av beis din in the city of Tozeur, Tunisia, found that the stones of the Choshen allude to the reward promised for one who is strict to answer 90 amens. The Baal Haturim (Shemos 28:17, based on Yoma 73b) explains that aside for the names of the Shevatim, the letters of the names of the Avos were etched in the Choshen’s stones, and the sapphire had the name of Yissaschar with the addition of the letter tzaddik from the name of Yitzchak. So we find that the sapphire stone [right next to the diamond, יהלום, which is numerically equivalent to amen], it says יש שכר צ to teach us that one who is strict to answer ninety amens a day has his reward guaranteed (Piskei HaRosh Vol. I, Nesiv 11).
