Rabīʿ al-Abrār: al-Zamakhshari in ‘Rabīʿ al-Abrār’ said:

From The Messenger of Allāh صلى الله عليه وآله: No supplication is rejected if it is preceded with In the name of Allāh, The Entirely Merciful, The Especially Merciful (Bismillah al-Raḥmān al-Raḥīm). Indeed my nation (ummah) will come on the Day of Judgement saying In the name of Allāh, The Entirely Merciful, The Especially Merciful (Bismillah al-Raḥmān al-Raḥīm), whereupon their good deeds will increase in weight upon the scales.
The other nations will say: How heavy [in favour of good] is the scales of the nation of Moḥammed صلى الله عليه وآله !
Then the Prophets will say: Indeed, the beginning of their speech is inclusive of three Names from the Names of Allāh, the Most High. If it was placed in one scale, and the evil deeds of all creation placed in the other – indeed, [the scale] would tilt towards their good.

الزمخشري في ( ربيع الأبرار ) : عن النبي ( صلى الله عليه وآله ) : لا يرد دعاء أوله * ( بِسْمِ اللَّه الرَّحْمنِ الرَّحِيمِ ) * فإن أمتي يأتون يوم القيامة ، وهم يقولون : * ( بِسْمِ اللَّه الرَّحْمنِ الرَّحِيمِ ) * فتثقل حسناتهم في الميزان ، فتقول الأمم : ما أرجح موازين أمة محمد ( صلى الله عليه وآله ) ! فيقول الأنبياء : إن ابتداء كلامهم ثلاثة أسماء من أسماء الله تعالى ، لو وضعت في كفة الميزان ، ووضعت سيئات الخلق في كفة أخرى ، لرجحت حسناتهم