The Quran

لا تَجِدُ قَومًا يُؤمِنونَ بِاللَّهِ وَاليَومِ الآخِرِ يُوادّونَ مَن حادَّ اللَّهَ وَرَسولَهُ وَلَو كانوا آباءَهُم أَو أَبناءَهُم أَو إِخوانَهُم أَو عَشيرَتَهُم ۚ أُولٰئِكَ كَتَبَ في قُلوبِهِمُ الإيمانَ وَأَيَّدَهُم بِروحٍ مِنهُ ۖ وَيُدخِلُهُم جَنّاتٍ تَجري مِن تَحتِهَا الأَنهارُ خالِدينَ فيها ۚ رَضِيَ اللَّهُ عَنهُم وَرَضوا عَنهُ ۚ أُولٰئِكَ حِزبُ اللَّهِ ۚ أَلا إِنَّ حِزبَ اللَّهِ هُمُ المُفلِحونَ

Muhammad Asad

Thou canst not find people who [truly] believe in God and the Last Day and [at the same time] love anyone who contends against God and His Apostle - even though they be their fathers, or their sons, or their brothers, or [others of] their kindred.¹ [As for the true believers,] it is they in whose hearts He has inscribed faith, and whom He has strengthened with inspiration from Himself,² and whom [in time] He will admit into gardens through which running waters flow, therein to abide. Well-pleased is God with them, and well-pleased are they with Him. They are God's partisans: oh, verily, it is they, the partisans of God, who shall attain to a happy state!

The operative phrase of this passage is contained in the words, "anyone who contends against (man hadda) God and His Apostle": i.e., anyone who is engaged in active hostility against God's message and the person or the teachings of His Apostle. As regards relations with non-behevers who are not actively hostile to Islam,, the Qur'an explicitly permits and implicitly ordains in many places (e.g., in 60:89) kindness and friendliness towards them.
For my rendering of iuh as "inspiration" or, occasionally, as "divine inspiration", see note 2 on 16:2. As pointed out by Zamakhshari, the pronominal suffix in minhu may relate either to God - as in my rendering - or to the believers' faith, in which latter case the phrase could be rendered as "strengthened with inspiration (flowing] therefrom".