Genesis 42:1

וירא יעקב כי יש שבר כמצרים AND JACOB SAW THAT THERE WAS A SALE OF CORN IN EGYPT — How did he see it? Surely he did not see but he heard it, as it is said (v. 2) “Behold, I have heard ... What, then, is meant by “And Jacob saw”? He saw in a holy dim vision that there was שֶׂבֶר hope for him in Egypt, but it was not a true prophetic vision telling him plainly that it was Joseph in whom his hope lay (Genesis Rabbah 91:6). למה תתראו WHY DO YE LOOK UPON ONE ANOTHER? — Why do you show yourselves (pretend) before the children of Ishmael and the children of Esau as though you have plenty to eat (Taanit 10b). For at that time they still had some grain. I am of opinion that the real meaning of למה תתראו is: Why should every one gaze at you and wonder at you because you do not search for food before what you have in your possession comes to an end. From others I have heard that it has the meaning of leanness: why should you become lean through hunger? A similar use of the verb as that in the first explanation is (Proverbs 11:25) “And he that satisfieth abundantly shall be satisfied (יורא) also himself”.

Now when Ya῾aqov saw that there was corn in Miżrayim, Ya῾aqov said to his sons, Why do you look at one another?

וַיַּ֣רְא יַעֲקֹ֔ב כִּ֥י יֶשׁ־שֶׁ֖בֶר בְּמִצְרָ֑יִם וַיֹּ֤אמֶר יַעֲקֹב֙ לְבָנָ֔יו לָ֖מָּה תִּתְרָאֽוּ׃