Sheikh Salman al-Oadah
Ideally, the Qur'ân teacher is the one who should be teaching the children to respect the Qur'ân. He should be getting them into the habit of performing their ablutions before handling the book, especially if they are older children who can understand such things. If there is time, the teacher should make sure of this before he class begins. If a student needs to go out and make his ablutions during the class period, the student should be permitted to do so, with a warning to be better prepared n the future.
However, if this is impractical due to the limited time available for class, especially when there are many class periods in a day, then the teacher has the right to refuse to allow the students to leave and perform ablutions. This is because permitting them to do so would disrupt the proper conduct of the class and waste critical class time. We must also take into account the disturbance caused for other classes due to students roaming the halls during class time.
It is true that the majority of Islamic legal scholars consider it obligatory to be in a state of ritual purity in order to handle the physical text of the Qur'ân. However, many of those same jurists make a concession for young children and others like them who need to handle the Qur'ân for learning purposes.
We must also know that the question is one wherein there is legitimate scholarly disagreement. Some scholars determine that the hadîth evidence in support of obligating wudû' is not strong. And they do not consider wudû' to be an obligation.
We refer to what Mâlik relates in al-Muwatta' (478) and al-Dârimî in his Sunan (2312).
This is the view of al-Bukhârî and others. It is the official position of the Zâhirî school of law.
And Allah knows best.
Source: Islam Today