The Kitáb-i-Aqdas - The Most Holy Book
Index term: Girl(s)
n76.
Unto every father hath been enjoined the instruction of his son and daughter in the art of reading and writing
'Abdu'l-Bahá, in His Tablets, not only calls attention to the responsibility of parents to educate all their children, but He also clearly specifies that the "training and culture of daughters is more necessary than that of sons", for girls will one day be mothers, and mothers are the first educators of the new generation. If it is not possible, therefore, for a family to educate all the children, preference is to be accorded to daughters since, through educated mothers, the benefits of knowledge can be most effectively and rapidly diffused throughout society.
q43.
 
Question: Concerning the betrothal of a girl before maturity.
Answer: This practice hath been pronounced unlawful by the Source of Authority, and it is unlawful to announce a marriage earlier than ninety-five days before the wedding.