Translation of the verse 70 from Surah An-Naml : Number of verses 93 - - page 383 - Part 20.
And grieve you not for them, nor be straitened (in distress) because of what they plot.
And grieve not over them or be in distress from what they conspire.
(27:70) O Prophet, do not grieve for them nor feel distressed at their machinations. *87 -
*87) That is, "You have done full justice to your mission of preaching. Now if they do not listen to you, and wish to persist in their folly and deserve the Divine torment, you should not consume yourself by being distressed and grieved at their condition. Then, why should you feel vexed at their mean machinations that they are devising in order to fight the truth and to frustrate your movement of return `? You have Allah's power at your back. If they do not listed to you, they will only be harming themselves, not you."
Source : An-Naml Verse 70: And grieve not over them or be in distress from what they conspire.