Genesis 11:28

על פני תרח אביו IN THE PRESENCE OF HIS FATHER TERAH — meaning during his father’s lifetime (Genesis Rabbah 38:13). The Midrashic explanation is that he died through his father. For Terah accused his son Abram before Nimrod of having smashed his idols to pieces, and he cast him into a fiery furnace. Haran waited and said to himself, “If Abram proves triumphant I will be on his side; if Nimrod wins I shall be on his”. When Abram was saved they said to Haran, “Whose side are you on?” Haran replied, “I am on Abram’s side”. They therefore cast him into the fiery furnace and he was burnt to death. It is to this that the name of the place Ur-Kasdim (fire of the Chaldees) alludes (Genesis Rabbah 38:13). Menachem ben Seruk, however, explains that אור means a valley, as (Isaiah 24:15) “Glorify ye the Lord in the valleys (באורים)”, and as (Isaiah 11:8) “the den (מאורת) of the basilisk”. Every hole or deep cleft may be called אור.

וַיָּ֣מׇת הָרָ֔ן עַל־פְּנֵ֖י תֶּ֣רַח אָבִ֑יו בְּאֶ֥רֶץ מוֹלַדְתּ֖וֹ בְּא֥וּר כַּשְׂדִּֽים׃

And Haran died before his father Teraĥ in the land of his nativity, in Ur-kasdim.