'Commencement' in the Bible

it has seemed right to me also, after careful investigation of the facts from their commencement, to write for you, most noble Theophilus, a connected account,

For He saved us and called us with a holy call, not in accordance with our desserts, but in accordance with His own purpose and the free grace which He bestowed on us in Christ Jesus before the commencement of the Ages,

in hope of the Life of the Ages which God, who is never false to His word, promised before the commencement of the Ages.