Rashi on Exodus 25:30/רש"י על שמות כ״ה:ל׳

1לחם הפנים SHEW-BREAD (lit., bread of faces) — It was so called because it had “faces” (פנים) as I have explained (v. 29). The number of loaves and the way they were set in piles are fully explained in the Sidrah אמר אל הכהנים (Leviticus 24:5—9).