"Not parted from the Father's bosom, O sweetest Jesus..."

The Ascension of Christ (source)

  
Not parted from the Father's bosom, O sweetest Jesus, and having lived among those on earth as man, today You have been taken up in glory from the Mount of Olives, and exalting in Your compassion our fallen nature, You have seated it with the Father. Therefore the heavenly ranks of the Bodiless Powers were amazed at the wonder, and beside themselves with fear; and seized with trembling, they magnified Your love for mankind. With them, we on earth also give glory for Your condescension to us and Your Ascension from us; and we supplicate You, saying: “At Your Ascension You filled with boundless joy the Disciples and the Theotokos who bore You; by their prayers make us also worthy of the joy of Your elect through Your great mercy!”
-Doxastikon of the Stichera for the Great Vespers for the Ascension of Christ

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Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!