 Rabbi Heiman and Rabbi Chaim Ozer Grodzinski gave Rabbi Lefkowitz letters of recommendation to show the roshei yeshiva of the Hebron Yeshiva, in which they wrote, "He will enlighten the Torah world".At the Hebron Yeshiva, which had relocated to Jerusalem after the 1929 Hebron massacre, Rabbi Lefkowitz became very close to Rabbi Leib Chasman.Rabbi Heiman also referred Rabbi Lefkowitz to Rabbi Isser Zalman Meltzer, rosh yeshiva of Etz Chaim Yeshiva, and he became close to him as well.