Musannaf Ibn Abi Shaybah

Hazrat Abdur Rahman bin Abzi narrates that when Hazrat Zainab bint Jahsh passed away, Hazrat Umar recited four takbirs in the funeral prayer. Then he asked the noble wives who should descend her into the grave. They replied: The one who used to come to her during her lifetime (the one from whom she did not observe veiling).