The Testament of Isaac, like the Testament of Abraham is considered to be a Jewish work that was added to by Christians in the Christian era. It is unclear when it comes from, however is considered by some scholars to be a work that was complied in Alexandria around the time that Abraham and the Septuagint was complied.
The Testament of Isaac shows strong influences of Jewish thought dating to the Second Temple era, including the cloud-of-light in which angels and humans fly around. Examples of these flying clouds can be found in the Paraphrase of Shem, Acts of Peter, Acts of Peter and Andrew, 1st Conflict of Adam and Eve with Satan, Revelations of Metatron, Ethiopian Apocalypse of Peter, and the Apocalypse of John. In the Protevangelion, the cloud-of-light led the Magi to Jesus when he was born. In the Acts of Peter and the Acts of Peter and Andrew, the apostles flew around on clouds.
