What was Sai Baba's specific response and instruction when the family pleaded for their son's life in Chapter 34?

As detailed in Chapter 34, when the family from Malegaon arrived in Shirdi and pleaded with choked voices and pitiful faces for their son's healing, Sai Baba responded with compassion and reassurance. He told them to remain worry-free, stating that those who seek shelter in the Masjid shall never face downfall. Following this comforting assurance, Sai Baba, the King of Yogis, gave them a very direct and simple instruction. He told them, "Take this Udi and smear it on that wound," presenting the sacred ash as the definitive remedy for the ailment that had stumped medical experts.