The fire took one offering and not the other.
וְהֶבֶל הֵבִיא גַם הוּא מִבְּכֹרוֹת צֹאנוֹ וּמֵחֶלְבֵהֶן וַיִּשַׁע ה' אֶל הֶבֶל וְאֶל מִנְחָתוֹ׃
בראשית ד:ד
"And Hevel also brought, from the firstborn of his flock and from their fat. And Hashem turned to Hevel and to his offering."
Bereishis 4:4
Two walked out into the field. One walked back.
וַיֹּאמֶר קַיִן אֶל הֶבֶל אָחִיו וַיְהִי בִּהְיוֹתָם בַּשָּׂדֶה וַיָּקׇם קַיִן אֶל הֶבֶל אָחִיו וַיַּהַרְגֵהוּ׃
בראשית ד:ח
"And Kayin spoke to Hevel his brother, and when they were in the field Kayin rose against Hevel his brother and killed him."
Bereishis 4:8
His blood cried out from the ground.
וַיֹּאמֶר מֶה עָשִׂיתָ קוֹל דְּמֵי אָחִיךָ צֹעֲקִים אֵלַי מִן הָאֲדָמָה׃
בראשית ד:י
"And He said: What have you done? The voice of your brother's blood cries out to Me from the ground."
Bereishis 4:10
The ground would not give him its strength.
כִּי תַעֲבֹד אֶת הָאֲדָמָה לֹא תֹסֵף תֵּת כֹּחָהּ לָךְ נָע וָנָד תִּהְיֶה בָאָרֶץ׃
בראשית ד:יב
"When you work the ground it shall not continue to give you its strength. You shall be a wanderer and a drifter in the earth."
Bereishis 4:12