تَرصُدُ هَذِهِ الدِّرَاسَةُ ظَاهِرَةً عِلمِيَّةً فِي الجَامِعِ الصَّحِيحِ لِلإِمَامِ البُخَارِيِّ – عَلَيْهِ رَحْمَةُ اللهِ تَعَالَى – تَتَّصِلُ بِالعُلُوِّ النِّسبِيِّ فِي أَسَانِيدِهِ. وَإِذَا كَانَ بَعضُ العُلَمَاءِ قَد وَجَّهُوا عِنَايَتَهُم لِجَمعِ وَدِرَاسَةِ ثُلاثِيَّاتِ الإِمَامِ البُخَارِيِّ – وَهِيَ أَعلَى أَسَانِيدِ كِتَابِهِ –، فَإِنَّ غَيْرَهُمْ قَد اهْتَمَّ بِجَمْعِ رُبَاعِيَّاتِهِ. وَتَأْتِي هذه الدِّرَاسَةُ - فِي السِّيَاقِ ذَاتِهِ – وَسَطًا بَيْنَ جُهُودِ الفَرِيقَيْنِ، وَذَلِكَ بِجَمْعِ الأَحَادِيثِ المُلْحَقَةِ بِالثُّلاثِيَّاتِ فِي صَحِيحِ البُخَارِيِّ، مَعَ بَيَانِ وَجْهِ إِلْحَاقِهَا، وَالتَّعرِيفِ المُوجَزِ بِرُوَاتِهَا، وَبَيَانِ غَرِيبِهَا، وَالإِشَارَةِ إِلَى أَبرَزِ أَحكَامِهَا.  
 this study detects a scientific phenomenon in the sahih book of imam al-bukhari - may allah have mercy on him - related to the relative height in his narrators. While some scholars have devoted their attention to the collection and study of imam al-bukhari's trilogies( hadiths  of three narrators ) – which are the highest chains of transmission of his book – others have taken an interest in collecting his quatrains. ( hadiths  of four narrators ) this study comes - in the same context - a compromise between the efforts of the two groups, by collecting the hadiths attached to the trilogies in sahih al-bukhari, with a statement of the reason of its appendage, a brief definition of its narrators, its strange vocabulary, and a reference to its most prominent issues.