Musannaf Ibn Abi Shaybah 38950 — Announcing lost property: Abu Hanifah

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) forbade selling fruit before its ripeness becomes evident (badw al-salah) (the meaning of badw al-salah will be explained, as a saying of the Prophet, in a hadith a few hadiths later).