بِالحُسْنَى

بِالحُسْنَى is a phrase (شِبْهُ الجُمْلَةِ) consisting of a particle of pulling down (a preposition) and a genitive noun

PhraseParticle / NounNoun Particle
شِبْهُ الجُمْلَةِجَارٌ وَمَجْرُوْرٌاسْمٌ مَجْرُوْرٌحَرْفُ جَرٍّ
PhraseCompoundGenitive NounParticle of pulling down/Preposition
  
in goodnessبِالحُسْنَى=الحُسْنَى+بِ
in the bestthe bestin
Surah/Below are the 3 verses in the holy Quran containing the compoundبِالحُسْنَى
Verse
53-13
96-6and believes in the best وَصَدَّقَ بِالْحُسْنَى
92-9and denies the bestوَكَذَّبَ بِالْحُسْنَى