Musannaf Ibn Abi Shaybah 33420 — Those who used to say: when

Kharijah bin Zayd narrates from Sayyiduna Zayd bin Thabit (may Allah be pleased with him) that he said: When the grandmother on the mother's side is nearer than the grandmother on the father's side, the sixth share of the estate will go to her alone; and when the grandmother on the father's side is nearer than the grandmother on the mother's side, the sixth share of the estate will be divided between the two of them.