申命記 22:1

והתעלמת [THOU SHALT NOT SEE ANY OF THY BROTHER'S HERD … GO ASTRAY] AND HIDE THYSELF [FROM THEM] — i.e. one, as it were closes his eyes tight as though one does not see it. לא תראה … והתעלמת THOU SHALT NOT SEE … AND HIDE THYSELF [FROM THEM] — “thou shalt not see it, that thou hide thyself from it” (i.e. you see it only to hide thyself from it), this is the plain sense of the verse. Our Rabbis, however, said that the omission of the particle לא before the verb והתעלמת (one would expect כי תראה … לא תתעלם) suggests: There are times when you may hide yourself from it, etc. (Sifrei Devarim 225:4; Bava Metzia 30a).

לֹֽא־תִרְאֶה֩ אֶת־שׁ֨וֹר אָחִ֜יךָ א֤וֹ אֶת־שֵׂיוֹ֙ נִדָּחִ֔ים וְהִתְעַלַּמְתָּ֖ מֵהֶ֑ם הָשֵׁ֥ב תְּשִׁיבֵ֖ם לְאָחִֽיךָ׃

Thou shalt not see thy brother’s ox or his sheep go astray, and hide thyself from them: thou shalt surely bring them back to thy brother.