Sahih Muslim | Book 10 | Hadith Number 3671

Narrated by Ibn Umar (Allah be pleased with them)
Ibn Umar (Allah be pleased with them) reported Allah's Messenger'(may peace be upon him) as saying: Do not buy fruits (on the trees) until their good condition becomes clear. In the hadith transmitted on the authority of Shu'ba it was stated that Ibn Umar (Allah be pleased with them) was asked what good condition implied. He said: When (the danger of) blight is no more.