Exegesis:

kai apesteilen autous kērussein tēn basileian tou theou kai iasthai [tous astheneis] ‘and he sent them out to proclaim the kingdom of God and to heal the sick.’ For apostellō cf. on 1.19. For kērussein tēn basileian tou theou cf. on 4.43f and 8.1. tous astheneis is omitted by Nestle.

asthenēs (also 10.9) lit. ‘weak,’ hence ‘sick,’ ‘ill.’

Translation:

He sent them out. The pronoun may have to be specified, e.g. ‘those men,’ ‘the twelve,’ ‘his disciples.’

To preach, cf. on 3.3.

Quoted with permission from Reiling, J. and Swellengrebel, J.L. A Handbook on the Gospel of Luke. (UBS Handbook Series). New York: UBS, 1971. For this and other handbooks for translators see here . Make sure to also consult the Handbook on the Gospel of Mark for parallel or similar verses.