Allah, the Blessed and Exalted, says: "So eat of them and feed the distressed poor." [Surah al-Hajj: 28]
And He said: "And feed the one who is content and the one who asks." [Surah al-Hajj: 36]
Imam al-Shafi'i (may Allah have mercy on him) said: "Al-qani' is the one who asks, and al-mu'tarr is the visitor and the one who passes by at no fixed time."
And in another place he said: "Al-qani' is the poor person and al-mu'tarr is the visitor; and it has been said that (al-mu'tarr) is the one who presents himself to receive a gift from it (the sacrifice)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / Q19223
Imam al-Shafi'i (may Allah have mercy on him) said: Since Sayyidah Aishah (may Allah be pleased with her) narrated that the Prophet (peace and blessings be upon him) forbade it because of the desert people who had come, and then said: "Eat, give in charity, and store," and Sayyiduna Jabir (may Allah be pleased with him) narrated what we have mentioned, it is incumbent on whoever knows both matters together to say: The Prophet (peace and blessings be upon him) forbade it for a particular reason, so when a similar situation occurs it is forbidden, and when it does not, it is not forbidden; or to say: The Prophet (peace and blessings be upon him) forbade it at one time and then permitted it afterwards, and the later of his commands abrogates the earlier.
Imam al-Shafi'i (may Allah have mercy on him) said in another place: It seems that the Prophet's (peace and blessings be upon him) prohibition of keeping the meat of sacrifices beyond three days, when the desert people had come, was in the sense of what is preferable and not in the sense of an obligation, because Allah Almighty says concerning the sacrificial camels: "Then when they have fallen on their sides, eat of them and feed others" [Surah al-Hajj: 36], and this verse concerns the camels that their owners offer voluntarily.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19223
Ata (may Allah have mercy on him) says regarding this saying of Allah Almighty, "And feed the distressed poor" [Surah al-Hajj: 28]: (It is) the one who asks you.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19224
Sa'id bin Jubayr (may Allah have mercy on him) says: Al-qani' means "the one who asks," and al-mu'tarr means "the one who comes to you wanting something from you but does not ask you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19225
Al-Hasan (may Allah have mercy on him) says regarding this saying of Allah Almighty, "al-qani' and al-mu'tarr" [Surah al-Hajj: 36]: Al-qani' is the one who humbly asks a man for his need, and al-mu'tarr is the one who presents himself but does not ask.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19227
Ibn Abi Najih narrates from Mujahid (may Allah have mercy on him) regarding this saying of Allah Almighty, "So eat of them and feed the distressed poor" [Surah al-Hajj: 28]: Al-ba'is is "the one who, when he asks, asks with his hand"; al-qani' is "the one among your neighbours who covets the meat of your sacrifice"; and al-mu'tarr is "the one who comes to you himself but does not put his need before you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19230