We believe that Allah Almighty will place the scales to weigh people's deeds. He, Exalted be He, says: {We will place the scales of justice on the Day of Resurrection, and no soul will be wronged in the least. Even if a deed is the weight of a mustard seed, We will bring it forth. Sufficient are We as Reckoners.} [Surat al-Anbiyā’: 47] Allah Almighty also says: {The weighing [of deeds] on that Day will be true and just. Those whose scales [of good deeds] are heavy, it is they who will be the successful. But those whose scales are light, it is they who have lost their own souls, because they wrongfully rejected Our verses.} [Surat al-A‘rāf: 8-9] It is a real scale with two pans and a pivot, and it will weigh people's deeds.
We believe that deeds will be placed on the scales. The Prophet (may Allah’s peace and blessings be upon him) said: "There are two phrases which are light for the tongue, heavy on the scale, and dear to the Most Compassionate: 'Subhān Allah wa bihamdih; subhān Allah al-‘Azhīm' (Glory and praise be to Allah; glory be to Allah, the Most Great)." [Narrated by Al-Bukhāri (6682), Muslim (2694), At-Tirmidhi (3467), and Ibn Mājah (3806)]
In another Hadīth, the Prophet (may Allah’s peace and blessings be upon him) said: "Purification is half of faith, and al-hamdulillāh (praise to Allah) fills the scale." [Narrated by Muslim (223), At-Tirmidhi (3517), An-Nasā’i (2437), and Ibn Mājah (280)]
We know that a person will be placed on the scale along with his deeds. Abu Hurayrah (may Allah be pleased with him) reported: The Prophet (may Allah’s peace and blessings be upon him) said: "On the Day of Resurrection, there will be brought forth a bulky person whose value to Allah will be less than that of the wing of a mosquito." And he said: "Recite: {And We will give no weight to them on the Day of Resurrection.} [Surat al-Kahf: 105]" [Narrated by Al-Bukhāri (4729) and Muslim (2785)] Also, the records of deeds will be placed on the scales, as indicated by the Hadīth of the Card. [Narrated by At-Tirmidhi (2639), Ibn Mājah (4300), Ibn al-Mubārak in Al-Musnad (100) and in Az-Zuhd (2/109), and Ahmad (6994)]