Abdullah ibn Umar
While the overwhelming majority of people who lived in Medina as well as rebels gave their pledge, some major figures did not. Umayyads, kins of Uthman, escaped to Levant or remained in their houses and later refused Ali's legitimacy. Sa`ad ibn Abi Waqqas were absent and Abdullah ibn Umar abstained from offering his allegiance but both of them assured Ali that they wouldn't do anything against Ali.