Alexander Sperber reproduces Aramaic text of Targum Onkelos for Genesis 4:5.
Targum Onkelos Genesis 4:5 in Alexander Sperber, ed., The Bible in Aramaic: Based on Old Manuscripts and Printed Texts, Volume I: Pentateuch according to Targum Onkelos (Leiden: Brill, 1959), 6
וּבקַיִן וּבקוּרבָנֵיה לָא הֲוָת רַעֲוָא וּתקֵיף לְקַיִן לַחדָא וְאִתכְבִישׁוּ אַפוֹהִי
[Translation:
. . . but with Cain and his offering there was no favor. And it was very hard for Cain, and his face was subdued.]
The translation of this passage is taken from Accordance Bible software.