Every prostration raises a rank

Prostrate much, for each prostration raises you a rank and removes a sin.

Narrated by Thawban

You must prostrate much to Allah, for you will not prostrate once to Allah except that Allah raises you a rank by it and removes a sin from you.

Sahih Muslim 488

What this hadith teaches

Thawban gave this answer when asked about the deed that leads to Paradise. More voluntary prayer means more prostrations.

Reference and grade

Grade
Sahih (in Sahih Muslim)
Narrator
Thawban

The hadith in Arabic نص الحديث

عَلَيْكَ بِكَثْرَةِ السُّجُودِ لِلَّهِ فَإِنَّكَ لاَ تَسْجُدُ لِلَّهِ سَجْدَةً إِلاَّ رَفَعَكَ اللَّهُ بِهَا دَرَجَةً وَحَطَّ عَنْكَ بِهَا خَطِيئَةً

Arabic text of Sahih Muslim 488, as given on sunnah.com.