Parashas Vayigash · Passuk 46:26
All the persons belonging to Yaakov who came to Egypt — his own issue, aside from the wives of Yaakov’s sons — all the persons numbered sixty-six.
Torah Temimah points to classical sources reconciling the counts of 66 and 70.
TT lemma: the sixty-six.
English: “All the persons belonging to Yaakov who came to Egypt — his own issue, aside from the wives of Yaakov’s sons — all the persons numbered sixty-six.” These sixty-six are the direct descendants of Yaakov; the remaining (Yosef and his sons, and Yaakov himself or Yocheved according to tradition) complete the seventy.
Derash on the verse (midrashic accounting) — not a formal named middah of the 13.
Sixty-six of Yaakov’s descendants are listed before adding those already in Egypt or born on the way, yielding the traditional seventy.