Allah says:

[وَلاَ تَأْخُذْكُمْ بِهِمَا رَأْفَةٌ فِى دِينِ اللَّهِ]

(Let not pity withhold you in their case, in a punishment prescribed by Allah,) Meaning, with a ruling prescribed by Allah. So the meaning of the Ayah is: "Do not feel too sorry for them where the laws of Allah are established.'' This does not mean that we should not naturally feel pity when carrying out the punishment. What is prohibited here is the kind of pity that may make the judge ignore the punishment altogether. This is what is not permitted for the judge. Mujahid said,

[وَلاَ تَأْخُذْكُمْ بِهِمَا رَأْفَةٌ فِى دِينِ اللَّهِ]

(Let not pity withhold you in their case, in a punishment prescribed by Allah,) "If the matter is taken to the ruling authority, the punishment has to be carried out and cannot be stopped.'' This was also narrated from Sa`id bin Jubayr and `Ata' bin Abi Rabah. It was recorded in a Hadith:

«تَعَافَوُا الْحُدُودَ فِيمَا بَيْنَكُمْ، فَمَا بَلَغَنِي مِنْ حَدَ فَقَدْ وَجَبَ»

(Compromise with the matter of prescribed punishment mutually sorting it out among yourselves, for once a matter where the prescribed punishment is required reaches me, I am obliged to carry it out.) Allah's saying:

[إِن كُنتُمْ تُؤْمِنُونَ بِاللَّهِ وَالْيَوْمِ الاٌّخِرِ]

(if you believe in Allah and the Last Day. ) means, then do that, carry out the punishments on those who commit illegal sex, and strike them hard without causing any wound, so that he and others like him will be deterred by the terror of that. In Al-Musnad, it was recorded that one of the Companions said, "O Messenger of Allah, when I slaughter a sheep I feel pity for it.'' He said,

«وَلَكَ فِي ذلِكَ أَجْرٌ»

(You be rewarded for that.)