Sahih Bukhari Volume 5, Book 64, Hadith 4378

حَدَّثَنَا الصَّلْتُ بْنُ مُحَمَّدٍ، قَالَ سَمِعْتُ مَهْدِيَّ بْنَ مَيْمُونٍ، قَالَ سَمِعْتُ أَبَا رَجَاءٍ الْعُطَارِدِيَّ، يَقُولُ كُنَّا نَعْبُدُ الْحَجَرَ، فَإِذَا وَجَدْنَا حَجَرًا هُوَ أَخْيَرُ مِنْهُ أَلْقَيْنَاهُ وَأَخَذْنَا الآخَرَ، فَإِذَا لَمْ نَجِدْ حَجَرًا جَمَعْنَا جُثْوَةً مِنْ تُرَابٍ، ثُمَّ جِئْنَا بِالشَّاةِ فَحَلَبْنَاهُ عَلَيْهِ، ثُمَّ طُفْنَا بِهِ، فَإِذَا دَخَلَ شَهْرُ رَجَبٍ قُلْنَا مُنَصِّلُ الأَسِنَّةِ‏.‏ فَلاَ نَدَعُ رُمْحًا فِيهِ حَدِيدَةٌ وَلاَ سَهْمًا فِيهِ حَدِيدَةٌ إِلاَّ نَزَعْنَاهُ وَأَلْقَيْنَاهُ شَهْرَ رَجَبٍ‏.‏

Narrated By Abu Raja Al-Utaridi : We used to worship stones, and when we found a better stone than the first one, we would throw the first one and take the latter, but if we could not get a stone then we would collect some earth (i.e. soil) and then bring a sheep and milk that sheep over it, and perform the Tawaf around it. When the month of Rajab came, we used (to stop the military actions), calling this month the iron remover, for we used to remove and throw away the iron parts of every spear and arrow in the month of Rajab.