Our faith sometimes weakens and we become overwhelmed by our desires. The shaytān makes sin attractive to us, so we fall into things that Allāh has forbidden.
Now, the question is not whether or not you will sin, because mistakes are in fact part of our nature.
The question is: What will you do after you’ve sinned?
Prophet Muḥammad (ṣall Allāhu ʿalay-hi wa-sallam) said:
❝By the One in Whose hand is my soul, if you did not commit sin Allāh would do away with you and bring people who would commit sin then pray for forgiveness.❞ ― Muslim
❝yā-ʾayyuhā lladhīna ʾāmanū tūbū ʾilā llāhi tawbatan naṣūḥan❞
[O you who believe! Repent to Allah with sincere repentance!]
― Qur’ān, Sūrah al-Taḥrīm (The Forbidding), Chapter 66, verse 8
Repentance— an Opportunity!
The concept of tawbah is amazingly beautiful and unique in Islam. We don’t confess to any intermediary; we turn to our Creator directly.
Allāh (al-Ghaffār) has kept open the gates of repentance and commanded us to turn to Him. This is an amazing combination! The fact that we can repent at any time and the fact that Allāh gave us the knowledge of how to repent is a great rahmah (mercy).
Repentance brings success
❝wa-tūbū ʾilā llāhi jamīʿan ʾayyuha l-muʾminūna laʿallakum tufliḥūn❞
[And beg Allah to forgive you all, O believers, that you may be successful]
― Qur’ān, Sūrah an-Nūr (The Light), Chapter 24, verse 31
Repentance keeps you away hardship
❝ʾa-wa-lā yarawna ʾannahum yuftanūna fī kulli ʿāmin marratan ʾaw marratayni thumma lā yatūbūna wa-lā hum yadhdhakkarūn❞
[Do they not see that they are tried once or twice every year? Yet they neither repent, nor do they take admonition]
― Qur’ān, Sūrah al-Tawbah (Repentance), Chapter 9, verse 126
Repentance earns you Allah’s love
❝ʾinna llāha yuḥibbu t-tawwābīna wa-yuḥibbu l-mutaṭahhirīn❞
[Truly, Allah loves those who turn unto Him in repentance and loves those who purify themselves]
― Qur’ān, Sūrah al-Baqarah (The Cow), Chapter 2, verse 222
Repentance is returning to Allāh, giving up sin and hating it, regretting falling short in obedience to Allāh, and being determined not to do that sin again. If one of these three is missing, then your repentance is not sincere. If the sin has to do with the rights of another person, then there are four conditions: the three mentioned above plus restoring the rights of that person, like returning money and property.
Allāh says in Qur’ān:
❝ʾillā lladhīna tābū wa-ʾaṣlaḥū wa-bayyanū fa-ʾulāʾika ʾatūbu ʿalayhim wa-ʾana t-tawwābu r-raḥīm❞
[Except those who repent and do righteous deeds, and openly declare (the truth which they concealed). These, I will accept their repentance. And I am the One Who accepts repentance, the Most Merciful]
― Qur’ān, Sūrah al-Baqarah (The Cow), Chapter 2, verse 160.