Shema Yisroel(Deuteronomy 6: 5-9, 11:13-21, Numbers 15:37-41)the primary credo-statement and affirmation of monotheism in Judaism.
Its opening verse reads, "Hear, O Israel, the Lord is our God, the Lord is one." Since the Shema itself mentions the obligation to recite it "when you lie down and when you get up," i.e., in the morning and evening, it is included in the morning and evening prayers and recited upon awakening and retiring. It is a Jewish custom to recite it in times of danger and also to endeavor to make it one's final utterance before death.
Source: Binyomin Kaplan.