Exodus 4:8
JPS-1917וְהָיָה֙ אִם־לֹ֣א יַאֲמִ֣ינוּ לָ֔ךְ וְלֹ֣א יִשְׁמְע֔וּ לְקֹ֖ל הָאֹ֣ת הָרִאשׁ֑וֹן וְהֶֽאֱמִ֔ינוּ לְקֹ֖ל הָאֹ֥ת הָאַחֲרֽוֹן׃
And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign.
פירוש רש״י
והאמינו לקל האת האחרון THEY WILL BELIEVE THE VOICE OF THE LATTER SIGN — As soon as you say to them, “On your account have I been smitten — because I uttered slander about you”, they will believe you, for they are already experienced in this: that those who combine to harm them are smitten by plagues, e. g., Pharaoh and Abimelech who were punished on Sarah’s account.
תרגומים נוספים
וְהָיָה֙ אִם־לֹ֣א יַאֲמִ֣ינוּ לָ֔ךְ וְלֹ֣א יִשְׁמְע֔וּ לְקֹ֖ל הָאֹ֣ת הָרִאשׁ֑וֹן וְהֶֽאֱמִ֔ינוּ לְקֹ֖ל הָאֹ֥ת הָאַחֲרֽוֹן׃
And it shall come to pass, if they will not believe thee, nor hearken to the voice of the first sign, that they will believe the voice of the latter sign.