SHEMA (Hear oh Israel) - שְׁמַע יִשְׂרָאֵל

The Shema Duet 6:4 is one of if not the most important prayer in Judaism. It's Israel's declaration that HASHEM is the only God. HASHEM is the only one worthy of their devotion and no other.
Hebrew:
שְׁמַע יִשְׂרָאֵל יְהוָה אֱלֹהֵינוּ יְהוָה אֶחָד׃
בָּרוּךְ שֵׁם כְּבוֹד מַלְכוּתוֹ לְעוֹלָם וָעֶד
Translation:
Hear oh Israel HASHEM our God HASHEM is One. Blessed be the name of the glory of His kingdom forever and ever.