Marrying a young girl does not mean..

Question
Al Salam alekum, I was in debate in Islam and therewas question
regarding the answer to the following translation of the Quran from
Al_Tabari Al-Tabari (may Allaah have mercy on him) said: The
interpretation of the verse "And those of your women as have passed
the age of monthly courses, for them the 'Iddah (prescribed period),
if you have doubt (about their periods), is three months;and for those
who have no courses [(i.e. they are still immature) their 'Iddah
(prescribed period) is three months likewise". He said: The same
applies to the 'idaah for girls who do not menstruate because they are
too young, if their husbands divorce them after consummating the
marriage with them. thatthe last comment (He said: The same applies to
the 'idaah for girls who do not menstruate because they are too young,
if their husbands divorce them after consummating the marriage with
them. ") they conclude the meaning in having `Iddah after having
intercourse with minor girl who did not reach the age of puberty. by
highlighting the words (consummating the marriage) can you explain it
please. thanks.
Answer
All perfect praise be to Allaah, The Lord of the Worlds. I testify
that there is none worthy of worship except Allaah, and that Muhammad
, is His Slave and Messenger.
Giving a young girl in marriage is something permitted in Islam. We
have previously pointed that out in Fataawa 88199 and 116746 .
Praisebe to Allaah, there is no ambiguity in the opinion that Imaam
At-Tabari mentioned. That is because if the young girl is not able for
intercourse, then it is not permissible for her guardian to give her
to her husband until she becomes able for it. If herhusband divorces
her before consummating marriage with her, then there is no 'Iddah
(i.e. waiting period) and thus she is not included in that verse;
rather, she is included in the saying of Allaah The Almighty (which
means): { O You who have believed, when you marry believing women and
then divorce them beforeyou have touched them, then there is not for
you any waiting period to count concerning them. So provide for them
and give them a gracious release. }[Quran 33:49]
However, if she is able for intercourse and her husband asks for her,
and she was given to him, and he had intercourse with her and then
divorced her, then 'Iddah will be obligatory upon her.
Allaah Knows best.