How do we know that Jesus must bring His other sheep?

The necessity of Jesus bringing His other sheep arises from the divine plan established by the Father, who has given them to the Son from before the foundation of the world. As Jesus states, 'them also I must bring,' indicating that salvific action is not merely optional but essential to fulfilling His mission. This is reinforced by the truth that Christ has laid down His life for these sheep, underscoring His role as the Good Shepherd who intimately knows and will not lose a single one. This act of bringing His sheep into the fold is part of His purpose and is rooted in His love and redemptive work for His people.