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8. Concealing one’s supplication and lowering the voice
It is recommended that one conceal his supplications and not raise his voice, in accordance with the saying of Allah the Exalted:
“Call upon your Lord humbly and secretly.” [Al-Aʿrāf: 55]
Concealing supplication is closer to sincerity. For this reason, Allah, Mighty and Majestic, praised the supplication of Zakariyyā, peace be upon him, saying:
“When he called out to his Lord privately.” [Maryam: 3]
According to one view among the scholars of Tafsir, this was in pursuit of sincerity.