Guru - all vibhaktis

गुरुरेव गतिः गुरुमेव भजे

गुरुणैव सहास्मि नमो गुरवे |

न गुरोः परमं शिशुरस्मि गुरोः

मतिरस्ति गुरौ मम पाहि गुरो ||

gurureva gatiḥ gurumeva bhaje

guruṇaiva sahāsmi namo gurave |

na guroḥ paramaṁ śiśurasmi guroḥ

matirasti gurau mama pāhi guro ||i

This śloka to Guru in anuṣtup metre has all the seven vibhaktis and sambodhana for singular - eka vaćana and in the sequential order so that one can memorize all the vibhaktis for Guru.

Guru is my refuge (Guru as karta - prathama)

I worship only Guru (Guru as object of worship - dvitiya)

I am always with Guru ("with" - tritiya)

Salutations to Guru ("to" - chaturthi)

Nothing greater than Guru ("than", from - pañchami)

I am child of Guru ("of" - ṣaṣṭi)

My intellect is in Guru ("in" - saptami)  

Save me, O Guru (addressing Guru - sambodhana)

For detailed explanation of the grammar and proper pronunciation, please see

https://www.sanskritfromhome.in/explanation/shlokas/gurureva-gatih-english/