21:47
And We set the scales (of) the justice for (the) Day (of) the Resurrection, so not will be wronged any soul (in) anything. And if (there) be weight (of) a seed of a mustard We will bring [with] it. And sufficient (are) We (as) Reckoners.

31:16
"O my son! Indeed it, if it be (the) weight (of) a grain of a mustard seed, and it be in a rock or in the heavens or in the earth will bring forth it Allah. Indeed, Allah (is) All-Subtle, All-Aware.