Parashas Masei · Passuk 36:6 · TT note 2
Chabad.org — English translation + Rashi
Torah Temimah points to Bava Basra 120a (TT note on “זֶה הַדָּבָר”).
E-Daf — Bava Basra 120a · Sefaria
English: It was taught: There is something among the fathers that is not among the children — of the fathers it says “and every daughter who inherits a possession,” among the fathers yes, among the children no. What is the implication? Rava said: “This is the matter” — this matter shall apply only in this generation.
The intra-tribal marriage rule bound only the generation of the land division.
Later generations are not bound by the restriction that an heiress must marry within her father’s tribe.