Abu Al-Bakhtari says that once I asked Sayyiduna Ibn Abbas (may Allah be pleased with them both) about the sale of date palm trees. He replied that the Prophet (peace and blessings be upon him) forbade it until he himself tastes from it or lets someone else taste it, and until its weight has been determined. I asked: What is meant by weight? He said: Whoever has dates should weigh them so that he can separate and collect them.