Is it permissible for a Muslim to suffice with supplication during prostration without supplicating after the prayer, in order to avoid showing off and difficulty concentrating? And is it true what was narrated from 'Umar ibn Al-Khattab, may Allah be pleased with him, regarding the prohibition of standing up immediately after the prayer, and that this was a cause for the destruction of those before us?

It is recommended for a Muslim, after prayer, to engage in seeking forgiveness (istighfar), remembrance of Allah (dhikr), and glorification (tasbih), in emulation of the Prophet’s Sunnah. Furthermore, supplication (du’a) after the obligatory prayer is encouraged and hoped to be answered.

Supplication during prostration (sujud) is better and more likely to be answered, based on the Prophet’s (peace be upon him) saying: “The closest a servant is to his Lord is when he is prostrating, so increase your supplications.” And his saying: “As for prostration, strive in supplication, for it is worthy of being answered for you.”

As for the hadith, “Whoever does not ask Allah, He will be angry with him,” it is hasan (good), and its meaning refers to one who abandons supplication altogether or out of arrogance.

Fear of showing off (riya’) is not an excuse to abandon good deeds; rather, one must proceed with them and combat riya’.

Regarding a worshipper standing up immediately after prayer, the hadith narrated by Omar ibn al-Khattab does not indicate its prohibition, but rather warns against imitating the People of the Book by connecting the obligatory prayer with a supererogatory one without an interval.

In summary: There is no sin in standing up immediately after the obligatory prayer, but one misses out on the reward. It is appropriate to combine supplication in prostration and after prayer. Supplication in prostration is better and more likely to be answered.