Or HaChaim on Numbers 16:30/אור החיים על במדבר ט״ז:ל׳

1 ואם בריאה יברא ה׳ ופצתה האדמה את פיה, "If G'd will create a new creation and the earth will open its mouth, etc." Why did the word בריאה have to be repeated? Our sages in Sanhedrin 37 explain that the earth's mouth has remained closed ever since the day that the earth opened it in order to hide the blood of Abel whom Cain had slain and that this was the curse the Torah referred to in Genesis 4,11. This meant that whenever the earth wanted to open its mouth in order to sing G'd's praises it had to use its "wings" rather than its mouth. This is the meaning of Isaiah 24,16: מכנף הארץ זמרות שמענו, "we have heard songs from the wings of the earth." In this instance when Moses wanted to punish the wicked he said: ואם בריאה יברא השם "if the Lord will create a new creation." [The author explains why Moses did not say ואם יברא הי בריאה. Ed.] He referred to a creation which had once existed, namely the mouth of the earth, but which had been sealed due to some deed the earth had carried out so that for practical purposes this creative act of G'd had been undone. Now Moses wanted the mouth of the earth to be opened again so that it could swallow Korach and associates. Perhaps this was Moses' way of affording the earth an opportunity to make up for a time when it had opened its mouth to hide a sin, i.e. to swallow the blood of a righteous person, i.e. Abel.