Which book described the Arab invasion of Sindh for the very first time?

Solution (By Examveda Team)

Chach Nama ‎("Story of the Chach"), also known as the Fateh nama Sindh (Sindhi:‎ "Story of the conquest of Sindh"), and as Tareekh al-Hind wa a's-Sind (Arabic:‎ "History of India and Sindh"), is one of the main historical sources for the history of Sindh in the seventh to eighth centuries CE, written in Persian.