New Persian

English

The form of the Persian language that is used today, first attested from the late ninth century. It is distinguished from its precursor Middle Persian by the use of the Arabic script and an extensive borrowing of vocabulary.
- 1975, Gilbert Lazard, “The Rise of the New Persian Language,”, in Cambridge History of Iran, volume IV, page 597:
  It is particularly in its vocabulary that New Persian departs from Middle Persian, in two different ways. First, New Persian contains many words which are originally foreign to Persian proper and are betrayed by their form as belonging to other, northern or eastern Iranian dialects: New Persian owes much to Parthian and to related dialects and it has also borrowed from Soghdian. Secondly, it has admitted a considerable proportion of Arabic words, a proportion which has increased with time [...]
- 1986, Lawrence Paul Elwell-Sutton, “Arabic Language III”, in Encyclopedia Iranica, volume 2, page 234:
  the earliest samples of New Persian consist of a handful of verses dating from the end of the 3rd/9th century, by which time the influx [from Arabic] had been going on for two centuries.