A quote on Matthew 28.18-20:
Unlike other ancient teachers, Jesus’ disciples would not raise disciples for themselves but only for Jesus (23:8). Greek tradition could praise those who made many disciples (as in Diog. Laert. 8.1.16). Greek philosophers thought in terms of “conversion” to philosophy (see Nock 1933), and various pagan religious cults were propagated by travelers in antiquity (Stambaugh and Balch 1986:42; compare Acts 8:4). Judaism also spoke of sages as having disciples (see comment on 4:19; 19:21-22) and sometimes even persuading large numbers of people to become students of Torah (as in ARN 26, Section 54); they also separately recognized the conversion of Gentiles (see comment on 23:15; see De Ridder 1971). But ancient hearers would, and modern hearers should, recognize a drastic innovation in a command to disciple nations.