ASHORTWORK
Biblical Understanding based on the Record of Scripture
YHVH created the sun and the moon and set them in the heavens, in part, to show when to observe His Festivals. The date listed on this calendar for the start of the 1st month and the 7th month is based on the first projected sighting, after sunset, of the renewing of the light of the moon.
Ephesians 1:13-14 NLT
And now you Gentiles have also heard the truth, the good news that God saves you. And when you believed in Christ, He (God) identified you as His own by giving you the Holy Spirit, whom He promised long ago.
The spirit is God's guarantee that He will give us the inheritance He promised and that He has purchased us to be His own people. He did this so we would praise and glorify Him.