An addoo ilayya AAibada Allahi innee lakum rasoolun ameen (surah Ad Dukhaan: 18)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(44:18) (and said): *15 'Deliver to me Allah's servants. *16 I am a trustworthy Messenger to you, *17

An addooo ilaiya `ibaadal laahi innee lakum Rasoolun ameen

*15) One should note that the sayings of the Prophet Moses being cited here, are not parts of a continuous address delivered by him at any one time, but they are a summary in a few sentences of what he said to Pharaoh and his courtiers on different occasions during many years. For the details, sec AI-A'raf: 103-136, Yunus: 75-92, Ta Ha : 45-76, Ash-Shua'ra: 10-68, An-Naml: 7-14, AlQasas: 32-42, AI-Mu'min: 23-46, Az-Zukhruf: 46-56 and the corresponding E.N.'s.
*16) That is. "Leave the children of Israel to go with me." This demand is synonymous with the demand made in Al-A`raf: 105, Ta Ha: 47 and Ash-Shur'ra: 17. Another translation that has been reported from Hadrat 'Abdullah bin `Abbas is: "Servants of Allah, fulfil my right," i.e.. "Accept what I say : believe in me: follow my guidance. This is my right on you from Allah. " The following sentence: `I am a trustworthy Messenger to you," is more in keeping with the second meaning.
*17) That is, "I am a reliable Messenger: I do not forge anything from myself, nor am I the one who would present something based on personal interest or desire, or forge a command or law, in the name of Allah. Rest assured that I shall convey to you intact only that which my Sender has commanded. " (It should be noted that these two sentences belong to the time when the Prophet Moses first started preaching His Message).