

And the weighing [of deeds] that Day will be the truth. So those whose scales are heavy – it is they who will be the successful. And those whose scales are light – they are the ones who will lose themselves for what injustice they were doing toward Our verses.
(Surah Al-A’raf : 8-9)
The weighing of our deeds will definately take place on the Day of Judgment. There are some righteous deeds that will weigh heavily on the Scale. Some are mentioned below:
1. Tahleel, or saying Laa ilaaha ill-Allah (there is no god but Allah).
It was narrated that ‘Abdullah ibn ‘Amr ibn al-‘Aas said: The Messenger of Allah (blessings and peace of Allah be upon him) said:
“Allah will bring forth a man belonging to my ummah before all creatures and will spread ninety-nine scrolls [containing the record of his bad deeds] for him, each scroll extending as far as the eye can see. Then He will say, ‘Do you object to anything in this? Have my scribes who keep note wronged you?’ He will say, ‘No, my Lord.’ He will ask him, ‘Do you have any excuse?’ He will say, ‘No my Lord.’ Allah will say, ‘On the contrary, you have with Us a good deed, and you will not be wronged this Day.’ A slip of paper will then be brought out, on which are the words ‘Ashhadu an laa ilaaha ill-Allah wa ashhadu anna Muhammadan ‘abduhu wa rasooluhu (I bear witness that there is no god but Allah, and I bear witness that Muhammad is His slave and His Messenger).’ Allah will say, ‘Bring your balance.’ The man will say, ‘O Lord, what is this slip of paper in comparison to these scrolls?’ And He will reply, ‘You will not be wronged.’ The scrolls will then be put in one side of the Balance and the slip of paper in the other, and the scrolls will become light and the slip of paper heavy, for nothing could compare in weight to the name of Allah.”
Narrated by Ahmad (6699) and at-Tirmidhi (2639); classed as saheeh by Shaykh al-Albaani (may Allah have mercy on him).
2. Remembrance of Allah – Tasbeeh, Tahmeed, Tahleel, and Takbeer
The Prophet (blessings and peace of Allah be upon him) said:
“Two words which are light on the tongue but will weigh heavily in the Balance and are beloved to the Most Merciful: Subhaan Allah il-‘Azeem, Subhaan Allahi wa bi Hamdihi (Glory be to Allah the Almighty, Glory and praise be to Allah.”
Al-Bukhaari (6406) and Muslim (2694).
3. Good Attitude
It was narrated from Abu’d-Darda’ that the Prophet (blessings and peace of Allah be upon him) said: “There is nothing that weighs more heavily in the Balance than a good attitude (with people).”
Narrated by Abu Dawood (4799); classed as saheeh by Shaykh al-Albaani (may Allah have mercy on him) in Saheeh Abi Dawood.