Narrated Nubayshah: A man called the Messenger of Allah ﷺ: We used to sacrifice Atirah in pre-Islamic days during Rajab; so what do you command us? He said: Sacrifice for the sake of Allah in any month whatever; obey Allah, Most High, and feed (the people). He said: We used to sacrifice a Fara in pre-Islamic days, so what do you command us? He said: On every pasturing animal there is a Fara which is fed by your cattle till it becomes strong and capable of carrying load. The narrator Nasr said (in his version): When it becomes capable of carrying load of the pilgrims, you may slaughter it and give its meat as charity (sadaqah). The narrator Khalid's version says: You (may give it) to the travellers, for it is better. Khalid said: I asked Abu Qilabah: How many pasturing animals? He replied: One hundred.
Hadith Referenceسنن ابي داود / كتاب الضحايا / 2830
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح, مشكوة المصابيح (1478)
Hadith Takhrij« سنن النسائی/الفرع والعتیرة 1 (4233)، سنن ابن ماجہ/الذبائح 2 (3137)، (تحفة الأشراف: 11586)، وقد أخرجہ: مسند احمد (5/75، 76) (صحیح) »
´It was narrated that Nubaishah said:` "It was said to the prophet: 'During the Jahiliyyah we used to offer the 'Atirah.' He said: 'Slaughter for the sake of Allah, the Mighty and sublime, no matter what month it is; do good for the sake of Allah, the Mighty and sublime, and feed the poor."'
Hafiz Muhammad Ameen
The intended meaning is that virtue is not restricted to any particular month; the poor can be fed at any time. Restricting it to the month of Rajab is not appropriate. To designate any month, day, or time from one’s own side and then consider it obligatory or superior is not correct. The reason for this is that it is neither the right nor the responsibility of any human being to specify particular times, days, or months and years for any act of virtue; rather, the determination of time for virtue is solely the right of Allah Ta‘ala. No one else has the authority to make changes in this regard. Furthermore, it is also necessary that the manner and quantity of virtue be exactly as prescribed by the Shari‘ah. Any excess beyond this will be considered an innovation (bid‘ah) and a human invention.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 4233