Surah No. 9, At Taubah, Ayat No. 28
يَا أَيُّهَا الَّذِينَ آمَنُواْ إِنَّمَا الْمُشْرِكُونَ نَجَسٌ فَلاَ يَقْرَبُواْ الْمَسْجِدَ الْحَرَامَ بَعْدَ
عَامِهِمْ هَـذَا وَإِنْ خِفْتُمْ عَيْلَةً فَسَوْفَ يُغْنِيكُمُ اللّهُ مِن فَضْلِهِ إِن شَاء إِنَّ اللّهَ
o عَلِيمٌ حَكِيمٌ
O believers ! Truly the pagans (Mushrikeen) are unclean; so let them not, come near the Sacred Mosque (Masjid-e-Haram) after this year. And if you fear poverty, soon Allah will enrich you, if He wills out of His bounty, for Allah is All-Knowing, All-Wise.
Book No. 8 (Prayer) Sahih Bukhari
Hadis No. 365
Narrated Abu Huraira: On the Day of Nahr (10th of Dhul-Hijja, in the year prior to the last Hajj of the Prophet when Abu Bakr was the leader of the pilgrims in that Hajj) Abu Bakr sent me along with other announcers to Mina to make a public announcement: "No pagan is allowed to perform Hajj after this year and no naked person is allowed to perform the Tawaf around the Ka'ba. Then Allah's Apostle sent 'All to read out the Surat Bara'a (At-Tauba) to the people; so he made the announcement along with us on the day of Nahr in Mina: "No pagan is allowed to perform Hajj after this year and no naked person is allowed to perform the Tawaf around the Ka'ba."