37 The Kethib is וְנָשׁוּב (vénashuv, “and we will return,” ו [vav] conjunction + Qal imperfect 1st person common plural from שׁוּב [shuv, “to return”]). The Qere is וְנָשׁוּבָה (vénashuvah, “and let us return,” ו [vav] conjunction + Qal cohortative 1st person common plural from שׁוּב [shuv, “to return”]). The cohortative after a volitive indicates purpose (“so that”). There is a wordplay in Hebrew between “Bring us back” (Hiphil imperative of שׁוּב [shuv, “to return”]) and “let us return” (Qal imperfect of שׁוּב [shuv, “to return”]). This repetition of the root שׁוּב (shuv) is significant; it depicts a reciprocal relationship between God’s willingness to allow the nation to return to him on one hand and its national repentance on the other.
38 Heb “our days.” The term “days” is a synecdoche of time (= days) for what is experienced within that time span (= life) (e.g., Gen 5:4, 8, 11; 6:3; 9:29; 11:32; 25:7; 47:8, 9; Deut 22:19, 29; 23:7; Josh 24:31; Judg 2:7, 18; 2 Sam 19:35; Job 7:1, 16, 18; Pss 8:9; 39:5, 6; 90:9, 10, 12, 14; 103:15; Prov 31:12; Eccl 2:3; 5:17, 19; 6:3).
39 Heb “as of old.”