Narrated Shu'bah:"'Adi bin Thabit and 'Ata bin As-Sa'ib informed me, from Sa'eed bin Jubair, from Ibn 'Abbas - and one of them mentioned that it was from the Prophet (ﷺ) - that he mentioned that Jibra'il began shoving clay in the mouth of Fir'awn out of fear that he would say La Ilaha Illallah and Allah would have mercy upon him - or fearing that Allah would have mercy upon him
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“Read in the name of your Lord who created.” 96:1
“My Lord, increase me in knowledge.” 20:114
“So remember Me; I will remember you.” 2:152
“Indeed, with hardship comes ease.” 94:6