God says
…. “O our Sustainer! Shower us with steadfastness, and make our steps firm: help us against those who deny the truth!” -- Q.2:250
…. (And God sees all that is in [the hearts of] His servants --) those who are steadfast, and truthful, and truly devout, those who spend [in God’s way and hoard not], those who pray for forgiveness from their innermost heart -- Q.3:17
… And God loves those who are firm and steadfast. -- Q.3:146
And bid thy people to pray, and persevere therein. …. Q.20:132
…. establish regular prayers, enjoin what is right and forbid what is wrong: and bear with patient constancy whatever (ill) may befall you; for this is firmness (of purpose) in (the conduct of) affairs! -- Q.31:17
Prophet said
1. “Good deed that pleases God most is that which is done regularly though it may be small”-- H: Bukhari and Muslim. N: Bibi Ayesha.