In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Ibn Abbaas [radiyallaahu-anhumaa] said that the Prophet [sallal laahu alayhi wasallam] said, “The most hated people to Allaah are three: a person who deviates from right conduct [i.e. an evil doer] in the Haram [sanctuaries of Makkah and Medeenah]; a person who seeks that the traditions of the Pre-lslamic Period of Ignorance should remain in Islam and a person who seeks to shed somebody’s blood without any right”.

Brief Commentary By Shaikh Zaid Bin Haadi [rahimahullaah]

These three deeds are from the major sins. The first major sin is Al-Ilhaad Fil Haram [i.e. deviating from right conduct in the sanctuaries of Makkah and Madeenah]. Ilhaad means to deviate from the truth [and enter into] falsehood, and supporting falsehood in order to obliterate the truth. Allaah [The Mighty and Majestic] censured the Mulhideen Fil Haram [i.e. those who deviate from right conduction in the sanctuaries of Makkah and Madeenah], saying: [وَمَن يُرِدۡ فِيهِ بِإِلۡحَادِۭ بِظُلۡمٍ۬ نُّذِقۡهُ مِنۡ عَذَابٍ أَلِيمٍ۬ – And whoever intends evil actions therein or to do wrong (i.e. practise polytheism and leave Islamic Monotheism), We shall make him taste a painful torment]. [Surah Al-Hajj. Aayah 25]

Allaah promised them [a severe punishment] due to the mere fact they intend evil actions therein [i.e. in the sanctuaries of Makkah and Madeenah], then how about perpetrating such deed! Indeed that would be a more severe sin, a more frightening state and a more severe punishment. This is a proof regarding the virtue of the sanctuaries of the Haram- that it is a sacred land chosen by Allaah and He made it a place where virtuous acts of worship are performed, [such as]  the Hajj which is one of the pillars of Islaam. Allaah gave this place virtues that cannot be enumerated, such as the increased reward attached to good deeds [performed in Makkah and Madeenah] and gave this land virtue over all other lands of the earth.

The second major sin is committed by the person who wants that the pre-Islamic traditions should remain in Islaam, as if he gives precedence to the pre-Islamic traditions – the evil customs that were followed during that period and the misguided deeds- over the Islamic practices, Eemaan, Ihsaan, their virtue and virtue of the Sunnah. He is guilty of committing a major sin, and this includes giving precedence to Bidah over [the authentic] Sunnah that guides to the straight path.

The third major sin is to seek to shed somebody’s blood without any right – meaning: seeking to shed the blood of a Muslim without right and doing so based on oppression and animosity. Shedding the blood of a Muslim is a great crime, just as the Prophet said, “The extinction of the whole world is less significant to Allaah than killing a Muslim [i.e. unlawfully]”. And he [sallal laahu alayhi wasallam] stated regarding the rights of the Ka’bah, “How great you are and how great is your sanctity! But the sanctity of a believer is greater than yours in the sight of Allaah”.

It is not permissible to transgress against the Muslims and the believers – males and females- in the sanctuaries of [Makkah and Madeenah] or in other places due to the great sin and punishment which results from that.

[Source: At-taleeqaat Al-Maleehah Alaa Silsilah Al-Ahaadeeth as-Saheehah. Vol 1. Pages 429-430. Slightly paraphrased]