Aya's 94 and 104 in Surah Yunus

Verse 94:
فَإِن كُنتَ فِي شَكٍّ مِّمَّا أَنزَلْنَا إِلَيْكَ فَاسْأَلِ الَّذِينَ يَقْرَءُونَ الْكِتَابَ مِن قَبْلِكَ لَقَدْ جَاءَكَ الْحَقُّ مِن رَّبِّكَ فَلَا تَكُونَنَّ مِنَ الْمُمْتَرِين
So if you (O Muhammad SAW) are in doubt concerning that which We have revealed unto you, then ask those who are reading the Book [the Taurat (Torah) and the Injeel (Gospel)] before you. Verily, the truth has come to you from your Lord. So be not of those who doubt it.

Verse 104:
قُلْ يَا أَيُّهَا النَّاسُ إِن كُنتُمْ فِي شَكٍّ مِّن دِينِي فَلَا أَعْبُدُ الَّذِينَ تَعْبُدُونَ مِن دُونِ اللَّهِ وَلَٰكِنْ أَعْبُدُ اللَّهَ الَّذِي يَتَوَفَّاكُمْ وَأُمِرْتُ أَنْ أَكُونَ مِنَ الْمُؤْمِنِينَ
Say: "O you mankind! If you are in doubt of my religion, (behold!) I worship not what you worship, other than Allah! But I worship Allah - Who will take your souls (at death): And I am commanded to be of the Believers.

Look closely at these 2 verses that are 10 verses apart in Surah Yunus. They speak of doubt. Interestingly, God almighty addresses the prophet's own doubt before commanding him to clear other people of their doubt. He heals him before the prophet can go heal others. Imagine if a salesperson were to sell a product they them self were not convinced of. They would not succeed in promoting that product to the fullest. When someone has 100% conviction in their product, then and only then will they get to their full potential success in promoting it. With God's wisdom, he did not command the prophet to promote this faith until he himself was 100% convinced of its message. Look at verse 94, Allah tells the prophet that if you are in doubt of what we have sent you, then ask those before you who read the Torah and Gospel. This Quran is but a continuation and final completion of these previous books of God. The prophet was only human, and seeing others around him questioning what he brought at first could have weakened him or gave him some uncertainty. God wanted to replace this doubt with conviction and complete faith. Only after doing that did God then command the prophet in verse 104 to address his own people's doubt and uncertainties. Now the prophet is certain, so he can clear the people's doubts in the faith. This was not just a product he had to convince them of, but rather this was their religion, their faith, their way of life. No doubt God had to prepare him for that, and that is exactly what God the Most-Wise did.