Al-Kāfi - Volume 7 > It is not Permissible to take an Oath by anything other than by Allah, most Majestic, most Glorious
Hadith #4

4- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ هَارُونَ بْنِ مُسْلِمٍ عَنْ مَسْعَدَةَ بْنِ صَدَقَةَ قَالَ قَالَ أَبُو عَبْدِ اللهِ (عَلَيْهِ السَّلام) فِي قَوْلِ اللهِ عَزَّ وَجَلَّ فَلا أُقْسِمُ بِمَواقِعِ النُّجُومِ قَالَ كَانَ أَهْلُ الْجَاهِلِيَّةِ يَحْلِفُونَ بِهَا فَقَالَ اللهُ عَزَّ وَجَلَّ فَلا أُقْسِمُ بِمَواقِعِ النُّجُومِ قَالَ عَظُمَ أَمْرُ مَنْ يَحْلِفُ بِهَا قَالَ وَكَانَتِ الْجَاهِلِيَّةُ يُعَظِّمُونَ الْمُحَرَّمَ وَلا يُقْسِمُونَ بِهِ وَلا بِشَهْرِ رَجَبٍ وَلا يَعْرِضُونَ فِيهِمَا لِمَنْ كَانَ فِيهِمَا ذَاهِباً أَوْ جَائِياً وَإِنْ كَانَ قَدْ قَتَلَ أَبَاهُ وَلا لِشَيْ‏ءٍ يَخْرُجُ مِنَ الْحَرَمِ دَابَّةً أَوْ شَاةً أَوْ بَعِيراً أَوْ غَيْرَ ذَلِكَ فَقَالَ اللهُ عَزَّ وَجَلَّ لِنَبِيِّهِ (صَلَّى اللهُ عَلَيْهِ وَآلِه) لا أُقْسِمُ بِهذَا الْبَلَدِ وَأَنْتَ حِلٌّ بِهذَا الْبَلَدِ قَالَ فَبَلَغَ مِنْ جَهْلِهِمْ أَنَّهُمُ اسْتَحَلُّوا قَتْلَ النَّبِيِّ (صَلَّى اللهُ عَلَيْهِ وَآلِه) وَعَظَّمُوا أَيَّامَ الشَّهْرِ حَيْثُ يُقْسِمُونَ بِهِ فَيَفُونَ.

4. Ali ibn Ibrahim has narrated from Harun ibn Muslim from Mas’adah ibn Sadaqah who has narrated the following: “This is about the meaning of the words of Allah, most Majestic, most Glorious. ‘I do not swear by the places of the stars.’ (56:75) Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘People of the community of ignorance swore by the places of stars and Allah, most Majestic, most Glorious, said, “I do not swear by the places of stars.’” He (the Imam) said that He called their swearing as such a grave thing. He (the Imam) has said that people of the time of ignorance held the month of Muharram to be a great thing. They would not swear thereby as well as the month of Rajab and did not disturb in these months those going and coming around even if he may have killed one’s father. They would not expel from al- Haram (the Sacred area) an animal or sheep or camel and so on. Allah, most Majestic, most Glorious, said to His Holy Prophet, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, ‘I do not swear by this town and you are living in this town.’ (90:2-3) He (the Imam) said that their ignorance had climaxed to the level of making them to consider the killing of the Holy Prophet, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, as lawful. On the contrary they held days of the month with greatness whereby they swore and stood by such oaths.’”