Genesis 25:2

Quest. How could Abraham, being now about one hundred and forty years old, have so many children, when his body was dead in his hundredth year? Answ. Because that renewed strength which was miraculously conferred upon him, did still in a great measure remain in him, being not a temporary action, but a durable habit or power. These persons were the heads of several people dwelling in Arabia and Syria, where we shall find evident footsteps of their names amongst ancient geographers, only a little changed, which could not be avoided in their translation into another language. Midian, the father of those Midianites, of whom we read Genesis 36:35 Judges 6:2 Isaiah 10:26. From Shuah Bildad seems to be descended, Job 2:11.