According to Isaac Seligman Baer’s famed Seder Avodat Yisrael, one of the first scholarly siddurim critical editions ever published, there was a custom that on the day of a circumcision, the P’sukei d-Zimra reading of Shirat haYam along with a portion of its introduction would be recited aloud as a call and response by the mohel (circumcizer) and sandaḳ (godfather). Baer’s division of the verses (from Seder Avodat Yisrael, pp. 72-74) is included here, along with a new translation.