It is narrated from Ata that Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The obligatory shares are six; in these (issues) we do not accept 'awl (increase in shares by proportionate reduction).

Ayyub bin al-Harith said: A case involving two girls, a mother and father, and a husband came before Judge Shurayh, and he gave a verdict in it (i.e., without ‘awl, thus reducing the share). So the husband complained about this in the mosque. Abdullah bin Rabah summoned Judge Shurayh and asked him: What do you say about this? He replied: This man thinks I am unjust, and I consider him immoral because he gave a fatwa and concealed the full verdict. The man said: Then what do you say about two girls, a mother and father, and a husband? He said: The husband gets a quarter of the entire estate, and the mother and father each get one-sixth (i.e., six and six), and what remains is for the girls. What deficiency have I made for you? Abdullah bin Rabah said: I have not made any deficiency for you; Allah Almighty has stated your deficiency. For the two girls, two-thirds (four), for the parents, two sixths (1, 1), and for the husband, a quarter. And this issue will be calculated from seven and a half, and in this issue, ‘awl must be applied.