Prayer for a partner

In the story of Musa 'alayhi salam, after Allah tells him to go to Pharaoh, Musa makes the famous prayer:

قَالَ رَبِّ اشْرَحْلِى صَدْرِى

[Musa] said: My Lord, expand for me my breast [with assurance]

وَ يَسِّرْلِى أَمْرِى

And ease for me my task

وَ احْلُلْ عُقْدَةً مِنْ لِسَانِى

And untie the knot from my tongue

يَفْقَهُوا قَوْلِى

That they may understand my speech

Surah Taha : 25-28

Right after this, though, he makes a prayer, that's not so well known.  He asks Allah to appoint a minister from his family, his brother, Haroun.  And this is what Musa asks Allah for in this partner:

اشْدُدْ بِهِ أَزْرِى

Increase through him my strength

وَ أَشْرِكْهُ فِى أَمْرِى

And let him share my task

كَىْ نُسَبِّحَكَ كَثِيرًا

That we may exalt You much

وَ نَشْكُرَكَ كَثِيرًا

And remember You much

Surah Taha : 31-34

What a beautiful description of a partner and the purpose that they aim to achieve together.