Today the most common formal communication tool in social systems is writing so that formalization as one of the main structural dimensions of organization is measured in terms of the written rules level. Confidence-building of writing in administrative relationships is so that lawyers consider written documents as one of evidences in courts. As far as the validity of written documents exceeded spoken words. However, in Shiite jurisprudence, there is disagreement on the validity of Writing in making administrative decisions and contracts. In this study, taking a qualitative content analysis approach, we examined the position of writing in the Holy Quran and the traditions of Imams (as), and discussed the reasons for writing validity in administrative relations. Findings show that writing and written communication has juridical validity because of trust and confidence building in interrelationships. Besides, traditions of Imams (as) confirm it. Analysis of contrary evidences shows that writing may not be essentially valid but since it is a means of intention discovery, receive validity. Compared with spoken words, even higher validity of writing can be inferred from some juridical reasons.