Because at that time trust was more valuable than anything else. At that time, when people gave each other goods and money, they did not write an official receipt, did not go to a notary, and did not need a witness.
Çünki o vaxtlar inam, etibar hər şeydən qiymətli idi. O vaxt insanlar bir-birinə mal-pul verəndə rəsmi qəbz yazmaz, notariusa getməz, şahidə ehtiyac olmazdı.