Kejadian 49:3

49:3 Reuben, you are my firstborn,

my might and the beginning of my strength,

outstanding in dignity, outstanding in power.

Mazmur 105:36

105:36 He struck down all the firstborn in their land,

the firstfruits of their reproductive power. ¹ 

[105:36]  ¹ tn Heb “the beginning of all their strength,” that is, reproductive power (see Ps 78:51).

[105:36]  sn Verses 28-36 recall the plagues in a different order than the one presented in Exodus: v. 28 (plague 9), v. 29 (plague 1), v. 30 (plague 2), v. 31a (plague 4), v. 31b (plague 3), vv. 32-33 (plague 7), vv. 34-35 (plague 8), v. 36 (plague 10). No reference is made in Ps 105 to plagues 5 and 6.