The answer is: Washed their feet

John 13:5

Before diving into the Last Supper, Jesus performed a powerful act: washing the feet of his disciples. This wasn't just a matter of hygiene; it was laden with profound significance. In the ancient world, foot washing was a task assigned to the lowest servant, yet here was Jesus, their revered teacher and leader, humbling himself to perform it.

This act served as a vivid illustration of servant leadership. It reminds us of a timeless principle—the importance of humility and serving others. Jesus' actions echo through the centuries, pushing against the grain of cultural norms that often elevate status over service. A fascinating bit of trivia: foot washing is still a practice observed in some Christian traditions during Holy Week, emphasizing this humility.

Moreover, John uniquely presents this scene that often stays shrouded in the shadow of the actual Last Supper. Unlike the synoptic Gospels, John offers a more intimate glance into Jesus’ final hours, focusing on lessons in love and service rather than the institution of Communion. The very word 'shin' in Hebrew relates to ‘to call’ or ‘to take the lower position,’ an uncanny tune to what Jesus performed that night.

With this memorable gesture, Jesus sets a legacy for his followers—encouraging everyone to drop their pretenses and wash each other’s “feet” in whatever forms that care might take. It's a challenge, inviting all to embody love, equality, and respect. What a mighty call to action for humanity!