The landing of the first ancestor of the Bakri Ajili family settled in the town of Rijal in the Rijal Almaa region at the end of the tenth century and the beginning of the eleventh century AH/late sixteenth century AD had an impact on its fame, and its valley - Wadi Kesan - which is located in its chest. When their great-grandfather Muhammad bin Musa al-Kesani al-Ajili traveled to Hijaz in the first half of the eleventh century, his close relationship with two sheikhs of the scholars of their time in both Mecca and Medina led to the establishment of scientific links between his town and the Hijaz. The reference to Wadi Kissan and his town appeared in their letters to him, when they attributed him to the valley, nicknamed him Kissani, and included in their letters to him instructions, advice, and legal teachings that they ordered him to spread in his town and community. Hence, this scientific paper will discuss these references and the scientific connection by presenting these letters and their contents; and introducing this scientific figure that was overlooked by all those who spoke about Al-Bakri Al-Ajili in Rijal, while addressing the personality of these two scholars and the close friendly relationship between him and his family with them in the first half of the eleventh century AH.