רָנִּ֥י עֲקָרָ֖ה לֹ֣א יָלָ֑דָה פִּצְחִ֨י רִנָּ֤ה וְצַהֲלִי֙ לֹא־חָ֔לָה כִּֽי־רַבִּ֧ים בְּֽנֵי־שׁוֹמֵמָ֛ה מִבְּנֵ֥י בְעוּלָ֖ה אָמַ֥ר יְהוָֽה׃
不懷孕、未曾生育的婦人哪，你要歡唱！未曾經歷產痛的，你要放聲歌唱，大聲歡呼！因為荒涼者的兒女，比有丈夫之婦人的兒女更多。這是永恆者說的。
Ibn Ezra
O barren, thou that didst not bear. The congregation of Israel is called barren and a woman that did not bear—the latter attribute being the explanation of the former—because of its small number.
Rashi
you who have not experienced birth pangs Heb. חָלָה, an expression of childbirth, for the woman in confinement gives birth with pains and writhing.