Yuhibbunahum Kahubbillah Wallazina Amanuu Ashaddu Hubban Lillah -al-baqarah - 165-

"وَمِنَ ٱلنَّاسِ مَن يَتَّخِذُ مِن دُونِ ٱللَّهِ أَندَادٗا يُحِبُّونَهُمۡ كَحُبِّ ٱللَّهِۖ وَٱلَّذِينَ ءَامَنُوٓاْ أَشَدُّ حُبّٗا لِّلَّهِۗ..."

According to classical tafsir and spiritual guides, this intense love is nurtured through: Quran Tafseer al-Baqarah - They Love Allah Most 165-6