Genesis 42:18

18 And on the third day Joseph said to them, Do this, if you would keep your lives: for I am a god-fearing man:

Genesis 42:18 Meaning and Commentary

Genesis 42:18

And Joseph said unto them the third day
His heart yearning towards them, though he put on such an appearance; finding they could not come to an agreement among themselves who should go on the errand, he thought fit to recede from his former order, and to give them another: this do, and live:
meaning what he was about to say to them, which if they punctually observed and performed, it would be the means of saving their lives: [for] I fear God;
and therefore would not do either an unjust or cruel thing. This might have given them an him who he was: but there being among the Gentiles, in all nations, some few that feared God, they took no further notice of it than this, that they might expect just and equitable dealings by him; since, though he was in such an high place, he knew and owned there was one higher than he, to whom he was accountable.

Genesis 42:18 In-Context

16 Send one of your number to get your brother, and the rest of you will be kept in prison, so that your words may be tested to see if you are true; if not, by the life of Pharaoh, your purpose is certainly secret.

17 So he put them in prison for three days.

18 And on the third day Joseph said to them, Do this, if you would keep your lives: for I am a god-fearing man:

19 If you are true men, let one of you be kept in prison, while you go and take grain for the needs of your families;

20 And come back to me with your youngest brother, so that your words may be seen to be true, and you will not be put to death. This is what you are to do.