أبو عبيدة بن الجراح
In 638 CE, Arabia fell into severe drought followed by a famine. Soon after, the reserves of food at Medina began to run out. Omar ordered caravans of supplies from Syria and Iraq, and personally supervised their distribution. His actions saved countless lives throughout Arabia. The first governor to respond was Abu Ubaidah ibn al-Jarrah, the governor of Syria and supreme commander of the Rashidun army.