ועתה ישראל מה ד' אלקיך שואל מעמך כי אם ליראה את ד' אלקיך ללכת בכל דרכיו ולאהבה אותו ולעבוד את ד' אלקיך בכל לבבך ובכל נפשך
In the Talmud Menachos 43b, Chazal derive from this pasuk that a Jew is obligated to recite one hundred brachos, blessings, daily. This is derived from the word, Mah, before the words, Hashem Elokecha sh’oel meimach, “What – does Hashem, your G-d, ask of you?” The “mah” is interpreted to mean meah, which means one hundred. Midrash Tanchuma, Korach 12, adds that David Hamelech initiated the decree to recite one hundred blessings daily as a merit to save the nation from continuing to lose one hundred men each day. Apparently, as explained by the Tur Orach Chaim 46, one hundred…