1st commandment. 1️⃣
Against idolatry:
Deuteronomy 5:7
[7]Thou shalt have none other gods before me.

Jesus reiterated the Shema, that God is only One:
Deuteronomy 6:4-5
[4]Hear, O Israel: The LORD our God is one LORD:☝️
[5]And thou shalt love the LORD thy God with all thine heart, and with all thy soul, and with all thy might.
🤗💗🧠💪

He revealed that the Son and the Father are One God:
John 17:21-22
[21]That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me. 🌏☄️🛂
[22]And...