In The Name of Allaah, The Most Merciful, The Bestower of Mercy

[الذَّرَّةُ  ]- It is one amongst the small ants.

Even good and bad deeds of an ant’s weight will be weighed on the scale on day of resurrection. So in this is a warning (or an important  notification) to the servants of Allaah that they do not belittle anything from the good deeds. Indeed, the Messenger (sallal-laahu-alayhi-wasallam) said, ”Save yourself from hell-fire even by giving half a date-fruit in charity”. [Bukhaari 1417]

[Abridged & paraphrased. Source: Ad-Duroos Al-Muhimmah Li-Aammatil Ummah’ page 18 by Sh Abdur Razzaaq Al-Badr  (may Allaah preserve him)]