Raising the Hands after Obligatory Prayers
A Muslim should invoke Allah secretly asking Him for whatever he desires, for invocation after performing the prayer and saying these glorious supplications of dhikr is more likely to be granted by Allah.
It is prohibited for a Muslim to raise his hands while invoking Allah after obligatory prayers as some people mistakenly do, for this is an act of innovation in religion; this may sometimes be done after supererogatory prayers.
Similarly, A Muslim should not raise his voice while invoking Allah, so as to be nearer to sincerity and submissiveness and far away from ostentation.
In some countries, some people are used to raising their voices and hands chorally while invoking Allah after performing the prayer, and sometimes the imam invokes Allah while raising his voice and hands as well. Such a practice is an abominable innovation in religion, as it has neither been narrated to have been observed by the Prophet (SAW) following prayers – be it the fajr ( dawn ) prayer, the Asr ( afternoon ) prayer, or any other obligatory prayer – nor deemed desirable by any Muslim.
Shaykhul Islam Ibn Taymiyyah said in this regard :
” Whoever reported it that Imam Ash-Shafi’i deemed it desirable ( i.e. deemed raising the voices and hands chorally in supplication desirable ) must have misquoted him.”
According to the above we have to follow in the footsteps of the Prophet (SAW) and stick to his Sunnah, for Allah Exalted be He says :
“And whatsoever the Messenger has given you, take it, and whatsoever he forbids you, abstain (from it), and fear Allah. Verily, Allah is Severe in punishment.” (Al-Hashr 59:7)
Allah Glorified be He also says:
” There has certainly been for you in the Messenger of Allah an excellent pattern for anyone whose hope is in Allah and the last day and [ who ] remembers Allah often.” [ Al Azhab 33:21]
A Summary Of Islamic Jurisprudence
Ash Shaykh Saalih Al Fawzaan