importance of zikr

Remember your Lord in your heart with humility and awe, and without speaking loudly, in mornings and evenings, and do not be among the heedless.

Surely, those who are with your Lord (angels) are never too proud to perform acts of worship to Him, but they glorify His Praise and prostrate before Him.

al a'raaf 205-206

Importance of zikr(2)

Once you have finished your Salah, then, remember Allah while standing, sitting and reclining. As soon as you are secure, perform Salah as due. Surely, Salah is an obligation on the believers that is tied up with time.

An-Nisa 103

Zikr's importance

Therefore remember Me (by praying, glorifying,). I will remember you (i.e keep blessing you), and be grateful to Me (for My countless Favours on you) and never be ungrateful to Me.
Al Baqarah 152

And who are more unjust than those who forbid that Allâh's Name be glorified and mentioned much (i.e. prayers and invocations, etc.) in Allâh's mosques and strive for their ruin? It was not fitting that such should themselves enter them (Allâh's Mosques) except in fear. For them there is disgrace in this world, and they will have a great torment in the Hereafter.
Al Baqarah 114