Close scrutiny required when loving or hating
In The Name of Allah, The Most Merciful, The Bestower of Mercy.
Allah said:
الْأَخِلَّاءُ يَوْمَئِذٍ بَعْضُهُمْ لِبَعْضٍ عَدُوٌّ إِلَّا الْمُتَّقِينَ
Bosom friends on that Day will be foes one to another except for the pious. [Al-Zukhruf 67]
Meaning on the Day of Judgment, those who established close friendships upon disbelief, disobedience to Allah and rejection (i.e. belied guidance), “Will be foes one to another” because their close friendships and love in the worldly life were for other than Allah, thus, they will turn into enmity on the Day of Judgment.
“Except for the pious”, who avoided Shirk and disobedience, for indeed their love for one another will endure and remain.
وَقَالَ إِنَّمَا ٱتَّخَذۡتُم مِّن دُونِ ٱللَّهِ أَوۡثَـٰنً۬ا مَّوَدَّةَ بَيۡنِكُمۡ فِى ٱلۡحَيَوٰةِ ٱلدُّنۡيَاۖ ثُمَّ يَوۡمَ ٱلۡقِيَـٰمَةِ يَكۡفُرُ بَعۡضُڪُم بِبَعۡضٍ۬ وَيَلۡعَنُ بَعۡضُڪُم بَعۡضً۬ا وَمَأۡوَٮٰكُمُ ٱلنَّارُ وَمَا لَڪُم مِّن نَّـٰصِرِينَ
And (Ibrahim) said: “You have taken (for worship) idols instead of Allah, and the love between you is only in the life of this world, but on the Day of Resurrection, you shall disown each other, and curse each other, and your abode will be the Fire, and you shall have no helper.” [Al-Ankabut 25]
How can they attach themselves to one who knows that he will free himself from those who worship him and curse them?! [Tafsir As-Sadi]
Abu Hurairah, may Allah be pleased with him, narrated that the prophet, peace and blessings of Allah be upon him, said: “Love your beloved one modestly, for it may be that he will become hated to you someday. And hate the one whom you hate modestly, for it may be that he will become your beloved one someday”.
Al-Allaamah Ibn Al-Atheer, may Allah have mercy upon him, stated: “This means that you should love your beloved one with moderation and do not go beyond bounds. Do not go into extremes in your love and hate, for it may be that one day you’ll hate the one you used to love and love the one you used to hate. Therefore, neither exaggerate in your love and become regretful (in future), nor exaggerate in your hatred and thus become shy in the presence of the one you used to hate after you stop hating him”. [An-Nihaayah 5/284]