במדבר, פרק כ״ט, פסוק כ׳

On the third day, a specific arrangement of sacrifices is brought forward. The system requires several types of completely unblemished animals. These offerings include rams as well as young sheep in their first year of life. Alongside these animals, exactly eleven bulls are sacrificed to complete the requirements for this particular day [ביאור שטיינזלץ].