Source in The Spiritual Meadow
The accounts of Christopher's life are preserved in The Spiritual Meadow (also called the Limonarion or Pratum spirituale), the Greek collection of monastic narratives and sayings compiled by John Moschus in the late sixth to early seventh century. Moschus gathered such material during his travels through the monasteries of Palestine, Sinai, and Egypt; his companion in those journeys was Sophronius, later Patriarch of Jerusalem.
Christopher's story is attributed within the work to Abba Theodulus, a fellow monk who related it. The synaxarion notes that the relevant accounts appear in chapters 105 and 234 of the book. Because the tradition derives from this single edifying source, the surviving record concentrates on his ascetic labors rather than on a full biography.