Musannaf Ibn Abi Shaybah 25590 — Mixing unripe dates, dates

It is narrated from Simak bin Musa al-Dabbi that he said: I saw the slave girl of Sayyiduna Anas bin Malik (may Allah be pleased with him) cutting away, from the semi-ripe dates, those that had ripened from the tail end. This slave girl would prepare the nabidh of these tail-ripened dates separately and the nabidh of the semi-ripe dates separately.