ISB ~ Mark 3 v14

he appointed twelve:Jesus spent the entire night in prayer before selecting the apostles (Lk 6:12).

• The number of apostles is symbolic: as the 12 sons of Jacob were representatives of Old Covenant Israel (Gen 49:3-28), so Jesus gathers 12 patriarchs to found his New Covenant people in the Church (Mt 19:28; Rev 21:12-14; CCC 551, 765).

to be sent out:An apostle is “one who is sent out” as a messenger or emissary (cf. Mt 10:5; CCC 858).

See chart below:The Twelve Apostles.