Trypho, pupil of Origen, to whom some of his extant letters are addressed, was very learned in the Scriptures, and this many of his works show here and there, but especially the book which he composed On the red heifer in Deuteronomy, and On the halves, which with the pigeon and the turtledoves were offered by Abraham as recorded in Genesis.
Source: De Viris Illustribus (Illustrious Men) (New Advent)