וְאֶל־קַ֥יִן וְאֶל־מִנְחָת֖וֹ לֹ֣א שָׁעָ֑ה וַיִּ֤חַר לְקַ֙יִן֙ מְאֹ֔ד וַֽיִּפְּל֖וּ פָּנָֽיו׃
mais à Caïn et à son offrande il ne fut pas favorable; Caïn en conçut un grand chagrin, et son visage fut abattu.
The Midrash of Philo
Why, when he had begun with Cain, he still mentions him here in the second place, when he says: "And God had respect unto Abel and unto his offerings; but unto Cain and unto his sacrifices he paid no attention?"(Genesis 4:5).
The Midrash of Philo
How it was that Cain became aware that his offering had not pleased God? (Genesis 4:5).