How do we know Jesus is eternal and without beginning?

The eternal nature of Jesus Christ is affirmed in scripture, particularly in Proverbs 8:22-31 where wisdom, which is identified as Christ, states that He was with God before the foundations of the earth. This implies that Jesus is not a created being but rather coexistent and coeternal with the Father. Additionally, scriptures such as John 1:1 confirm that the Word was with God and was God, highlighting His eternal existence. Jesus Himself reveals His nature in Revelation 1:8 as the Alpha and Omega, indicating that He has no beginning or end.