Matthew 5:2

And he opened his mouth
He spoke with a clear and strong voice, that all the people might hear him; and with great freedom, utterance, and cheerfulness, and things of the greatest moment and importance;

and taught them;
not his disciples only, but the whole multitude, who heard him with astonishment; see ( Matthew 7:28 Matthew 7:29 ) . Some things in the following discourse are directed to the disciples in particular, and others regard the multitude in general.