Did Abraham marry after Sarah died?

        Keturah (Gen. 25:1, 4; I Chron. 1:32, 33), second wife of Abraham, after the death of his beloved Sarah. Six sons were born to Keturah and Abraham: Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. From these sons descended six Arabian tribes of southern and eastern Palestine. The best-known tribe bearing the name of one of Keturah's children were the Midianites. We come upon them first as camel-riding merchants traveling from Gideon to Egypt with gum, balm, and myrrh; These same Midianites sold Joseph to the Ishmaelites for twenty sheckels of silver.
       Keturah's sons were not joint heirs with Sarah's son Isaac, who received his father's blessing and became heir to all his large holdings. In order that they might not interfere with Isaac, legitimate Son of Promise, Abraham made special gifts to his younger sons by Keturah and sent them away, just as he had sent Ishmael away.