The second condition regarding which there is a difference of opinion is the specification of the place of delivery (ifa'). The Qadi (al-Qadi Abu Ya'la) said: It is not a condition. Ibn al-Mundhir narrated this from Ahmad, Ishaq, and a group of the Hadith scholars (Ahl al-Hadith). Abu Yusuf and Muhammad (al-Shaybani) also held this view. It is one of the two opinions of al-Shafi'i, due to the saying of the Prophet (peace and blessings of Allah be upon him): "Whoever enters into a Salam contract, let him do so for a known measure, a known weight, and until a known term." He did not mention the place of delivery, which indicates that it is not a condition. Furthermore, in the hadith regarding it, the Jew entered into a Salam contract with the Prophet (peace and blessings of Allah be upon him), and the Prophet (peace and blessings of Allah be upon him) said: "Not from the orchard of the sons of so-and-so, but [in] a specified measure and until a specified term." He did not mention the place of delivery. Also, because it is a contract of exchange (mu'awada), mentioning the place of delivery is not a condition, like sales of specific items. Al-Thawri said: Mentioning the place of delivery is a condition; this is the second opinion of al-Shafi'i. Al-Awza'i said: It is disapproved (makruh), because possession becomes due upon its arrival, and its location is not known at that time, so stipulating it becomes necessary so that it is not unknown (majhul). Abu Hanifa and some of the companions of al-Shafi'i said: If carrying it involves a cost (mu'na), stipulating it is mandatory; otherwise, it is not mandatory, because if there is a cost for carrying it, the purpose regarding it differs, unlike cases where there is no cost. Ibn Abi Musa said: If they are in a wilderness (bariyya), it is necessary to mention the place of delivery; if they are not in a wilderness, mentioning the place of delivery is good, and if they do not mention it, the delivery is at the place of the contract. This is because whenever they are in a wilderness, delivery at the place of the contract is impossible, so if one omits mentioning it, it remains unknown. If they are not in a wilderness, the contract implies delivery at its location, so that is sufficient without mentioning it; if they do mention it, it is a confirmation, which is good. If he stipulates delivery in a different place, it is valid; because it is a contract of sale, so it is valid to stipulate the delivery in other than the place of [the contract], like sales of specific items. Also, because he stipulated the mention of the place of delivery, it is valid, just as if he had mentioned it at the place of the contract. Ibn Abi Musa mentioned another report that it is not valid, because he stipulated something contrary to what the contract implies, since the contract implies delivery at its location.