Abdur Rahman Ibn Auf (ra) session 42. Sayidul Muslimeen. Both The Custodian & Khalid ibn Al Waleed (ra) had the essentials on becoming the Caliph. 6 of the 10 are given the task to appoint the successor. 'Remain stable and united, if you differ its from your own selves.' Every Muslim house has suffered a deficiency by the death of Umar (ra).