Here are some of the things the divine messengers asked God for:
1- Expansion of breast (ability to face difficulties and adversities)
“’Lord’, said Moses, ‘expand my chest’.” (Verse 25 of Surah Taha)
2- Making tasks easy
“And ease my task for me.” (Verse 26 of Surah Taha)
3- Easing the spread of message
“And loose the knot from my tongue so they may understand what I say.” (Verses 27-28 of Surah Taha)
An interesting point here is that what Prophet Moses (AS) asks God for in these verses, God gave Prophet Muhammad (PBUH) without him asking:
“Have We not expanded your chest for you (Prophet Muhammad), and (have We not) relieved you of your burden?” (Verses 1-2 of Surah Al-Inshirah)