Vows were Made in Reference to Dedicating Children to God
Source: TTT
1 Samuel 1:11
And she made a vow, pleading, “O LORD of Hosts, if only You will look upon the affliction of Your maidservant and remember me, not forgetting Your maidservant but giving her a son, then I will dedicate him to the LORD all the days of his life, and no razor shall ever come over his head.”