With the name of Allah Most Gracious, Most Merciful
Sura 39 (Zumar-Crowds)
Praying directly to Allah is sincere worship
Verse 3: Is it not to Allah that sincere devotion is due? But those who take for protectors other than Allah (say): “We only serve them in order that they may bring us nearer to Allah.” Truly Allah will judge between them in that wherein they differ. But Allah guides not such as are false and ungrateful.
This verse addresses the misconception that people make, insisting on praying via intermediaries. Sincere worship is to Allah (SWT) alone. In the reference below, it is made even clearer. Those close to Allah (e.g Prophets, Saints etc.); they too seek means to get closer to Him and are in hope and fear. See also Sura 13 Verse 14.
Sura 17 Verses 57: Those whom they call upon do desire (for themselves) means of access to their Lord, – even those who are nearest: they hope for His Mercy and fear His Wrath: for the Wrath of thy Lord is something to take heed of