Quran 2:158

Surah Al-Baqara, Verse 158:
إِنَّ الصَّفَا وَالْمَرْوَةَ مِن شَعَائِرِ اللَّهِ فَمَنْ حَجَّ الْبَيْتَ أَوِ اعْتَمَرَ فَلَا جُنَاحَ عَلَيْهِ أَن يَطَّوَّفَ بِهِمَا وَمَن تَطَوَّعَ خَيْرًا فَإِنَّ اللَّهَ شَاكِرٌ عَلِيمٌ
Verily! As-Safâ and Al-Marwah (two mountains in Makkah) are of the Symbols of Allâh. So it is not a sin on him who perform Hajj or 'Umrah (pilgrimage) of the House (the Ka'bah at Makkah) to perform the going (Tawâf) between them (As-Safâ and Al-Marwah).And whoever does good voluntarily, then verily, Allâh is All-Recogniser, All-Knower. Reference: Sahih Bukhari (English),Volume 06,60. Prophetic Commentary,Hadith 023:-

Narrated `Asim bin Sulaiman:( May Allah be pleased with him)
I asked Anas bin Malik about Safa and Marwa. Anas replied, "We used to consider (i.e. going around) them a custom of the Pre-islamic period of Ignorance, so when Islam came, we gave up going around them. Then Allah revealed" "Verily, Safa and Marwa (i.e. two mountains at Mecca) are among the Symbols of Allah. So it is not harmful of those who perform the Hajj of the House (of Allah) or perform the Umra to ambulate (Tawaf) between them." (2.158)
Surah Al-Baqara, Verse 165:
وَمِنَ النَّاسِ مَن يَتَّخِذُ مِن دُونِ اللَّهِ أَندَادًا يُحِبُّونَهُمْ كَحُبِّ اللَّهِ وَالَّذِينَ آمَنُوا أَشَدُّ حُبًّا لِّلَّهِ وَلَوْ يَرَى الَّذِينَ ظَلَمُوا إِذْ يَرَوْنَ الْعَذَابَ أَنَّ الْقُوَّةَ لِلَّهِ جَمِيعًا وَأَنَّ اللَّهَ شَدِيدُ الْعَذَابِ
And of mankind are some who take (for worship) others besides Allâh as rivals (to Allâh). They love them as they love Allâh. But those who believe, love Allâh more (than anything else). If only, those who do wrong could see, when they will see the torment, that all power belongs to Allâh and that Allâh is Severe in punishment.
Reference: Sahih Bukhari (English),Volume 06,60. Prophetic Commentary,Hadith 024:-

Narrated `Abdullah:( May Allah be pleased with him)

The Prophet said one statement and I said another. The Prophet said "Whoever dies while still invoking anything other than Allah as a rival to Allah, will enter Hell (Fire)." And I said, "Whoever dies without invoking anything as a rival to Allah, will enter Paradise."