Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "The example of the believer is like that of the perfume-seller: if you sit with him, he will benefit you; if you walk with him, he will benefit you; and if you go into partnership with him, he will benefit you."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Layth bin Abi Sulaym, who is a mudallis (one who conceals defects in the chain).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 271