What happens when a believer remains faithful to the gospel in places where few are willing to go? In this episode, we explore Christ’s command to “beware of the leaven” through the life of missionary Samuel Zwemer, widely known as the “Apostle to Islam.” Driven by a deep love for Christ, Zwemer devoted his life to bringing the gospel to the Muslim world. Through years of sacrifice, suffering, bold witness, and unwavering commitment to biblical truth, he demonstrated the importance of keeping Christ preeminent and resisting the subtle errors that can draw believers away from the gospel. As we reflect on his legacy, we are encouraged to remain grounded in God’s Word, centered on the person and work of Jesus Christ, and faithful to His calling wherever He leads us.