من لا يحضره الفقيه, volume 3, page 280

Hadith.4009 - Abd al-Rahman ibn Abi Abdullah asked Abu Abdullah (as) about exchanging one slave for two slaves, or one slave for another slave along with dirhams. Imam (as) said: "There is no harm in exchanging all types of animals hand-to-hand."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.4010 - Sa'id ibn Yasar asked him about exchanging one camel for two camels, whether hand-to-hand or on credit. Imam (as) said: "Yes, there is no harm if their ages are specified, whether they are young or mature." Then Imam (as) instructed me to strike out the mention of credit because people say it is not allowed, and Imam (as) only did that as a precaution (taqiyyah).

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.4011 - Aban narrated from Salamah, from Imam Jafar ibn Muhammad Al-Sadiq (as) from his father, Imam Muhammad ibn Ali Al-Baqir (as) that: Imam Ali ibn Abi Talib (as) distributed clothing among the people in Iraq, and among the garments was a fine robe. Imam Hussain ibn Ali (as) asked him for it, but Imam Ali ibn Abi Talib (as) refused. Imam Hussain ibn Ali (as) then said: "I will give you two robes in exchange for it." Imam Ali ibn Abi Talib (as) refused. Imam Hussain ibn Ali (as) continued offering until he reached five robes. Imam Ali ibn Abi Talib (as) then took the robes from him, gave him the fine robe, and placed the robes in his lap, saying: "I will take five in exchange for one."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.