It wasnarrated that Ibn Dhu'aib said:
"A grandmother came to Abu BakrSiddiq and asked him for her inheritance. Abu Bakr said to her: 'Youhave nothing according to the Book of Allah, and I don't know ofanything for you according to the Book of Allah, and I don't knowof anything for you according to the Sunnah of the Messenger of Allah(ﷺ). Go back until I ask the people.' So he asked the people andAl-Mughirah bin Shu'bah said: 'I was present with the Messengerof Allah (ﷺ) and he gave her (the grandmother) one sixth.' AbuBakr said: 'Is there anyone else with you (who will corroboratewhat you say)?' Muhammad bin Maslamah Al-Ansari stood up and saidsomething like what Mughirah bin Shu'bah had said. So Abu Bakrapplied it in her case." (FR)
English reference (FR): Vol. 4, Book 23, Hadith 2724 (FR)
Arabic reference (FR): Book 23, Hadith 2828 (FR)