How do we know Jesus' sacrifice was for many?

The biblical witness consistently affirms that Jesus' sacrifice was intended for a specific group, often referred to as the elect or those whom the Father has given Him. In Mark 14:24, Jesus explicitly states that His blood is shed for many, which has theological implications regarding the particularity of His atonement. This reflects the historic Reformed understanding of Limited Atonement, where Christ's death secures the salvation of His chosen people, ensuring that it effectively accomplishes His divine purpose without failure. This aligns with the doctrines developed during the Reformation, emphasizing that true faith and salvation come through Christ alone.