An author has selected forty short hadiths tackling various religious subjects to present to young Muslims so that they can memorize and learn their meanings. it's called collection Al-Arba'?n al-Wild?niyyah as the hadiths are primarily catered to Muslim children. Every one of these forty hadiths is highly authentic, as they are narrated by one or both of the top two scholars of hadith sciences: Al-Bukhari and Muslim. May God bestow mercy on their souls.