Text this: The concepts of sakinah, mawaddah and rahmah as foundation for marital happiness according to the Holy Quran: an analysis based on Ayat 21, Surah al-Rum = Konsep Sakinah, Mawaddah dan Rahmah sebagai asas kebahagiaan rumahtangga menurut al-Quran: suatu analisis berdasarkan ayat 21, Surah al-Rum