It marked a rare instance of a public institution contradicting the president, who has presided over a wide-scale crackdown on dissent in recent years while seeking to rally the country's entrenched interests behind him.
The Council of Senior Clerics in Al-Azhar, the highest authority in Sunni Islam, unanimously ruled that verbal divorce, when meeting all requirements, has been an undisputed practice since the days of the 7th century Prophet Muhammad. The requirements, it explained, included that the man has a sound mind, full consciousness and uses appropriate phrasing.
In a carefully-worded statement, the council made no mention of el-Sissi, or his suggestion last month for legislation requiring such divorces to be carried out in the presence of a state-authorised cleric. It was addressed to "the people".
However, its rejection of the president's proposal was uncompromising, and it made a thinly-veiled reference to the constitution, which refers to Al-Azhar as the main authority on religious and Islamic affairs.
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The council expressed concern over the high rate of divorce in Egypt, where 40 per cent of marriages end in divorce within five years, according to figures cited by the president. But it pointed out that the figures include only documented divorces, suggesting that reducing the number of verbal divorces would have little impact.
Al-Tayeb, appointed by presidential decree, heads the Council of Senior Clerics.
Ayman al-Sayad, an analyst who closely monitors religious affairs, said that Al-Azhar's rejection of the proposal showed that it has "drawn a clear line between religion and politics." He added: "It has decisively settled the issue, but went to great lengths so as not to appear confrontational."