Commentary for Kiddushin 37:7

מאי הוי עלה תא שמע אמר ר' אייבו א"ר ינאי אין יעוד אלא בגדול אין יעוד אלא מדעת תרתי מה טעם קאמר מה טעם אין יעוד אלא בגדול לפי שאין יעוד אלא מדעת

to him by Scriptural law.<span class="x" onmousemove="('comment',' And therefore he acquires her by intercourse, though normally a minor's action has no force. Nine years and a day is the minimum age at which a male's intercourse counts, i.e., can engender.');">⁹</span> I might have thought, since she is tied to him by Biblical law and his intercourse is intercourse,<span class="x" onmousemove="('comment',' V. preceding note.');">¹⁰</span>

Daf Shevui to Kiddushin