"Recognize now whether it is your son's tunic" (Genesis 37:32). The Holy One, blessed be He, said to Judah: You said to your father, "Recognize now" by your life, Tamar will say to you, "Recognize now whose are this signet and these cords" (Genesis 38:25).
Judah's Words Recognize Now Are Turned Back Upon Him by Tamar
Yalkut Shimoni on Torah 142:2
(בראשית לז לב) הַכֶּר נָא הַכְּתֹנֶת בִּנְךָ הִוא. אָמַר לֵיהּ הַקָּדוֹשׁ בָּרוּךְ הוּא לִיְהוּדָה, אַתָּה אָמַרְתָּ לְאָבִיךָ הַכֶּר נָא, חַיֶיךָ שֶׁתָּמָר אוֹמֶרֶת לְךָ (בראשית לח, כה) "הַכֶּר נָא לְמִי הַחֹתֶמֶת (וּלְמִי) [וְ]הַפְּתִילִים".