Among the 28 church fathers now remembered in the 5th Tubden, St. Sleeba Mor Osthatheos is one among the five primates whose sacred remains are interred in Malankara. The other four primates remembered in the tubden and entombed in Malankara, are Patriarch St. Ignatius Elias III (Manjinikkara, 1932), Maphryono St. Baselios Yeldho (Kothamangalam, 1685), St. Gregorios Geevarghese Chathuruthil (Parumala, 1902) and St. Gregorios `Abded Jaleel (North Paravur, 1681)).
The names of other declared saints of Malankara, the Malankara Metropolitan St. Athanasius Paulose (Thrikkunnath Seminary, Alwaye), Maphryono St. Baselios Shakralla (Kandanad), St. Koorilos Yuyakkim (Mulanthuruthy) and Malankara Metropolitan St. Koorilos Paulose (Panampady) are remembered in the respective churches where their sacred remains are interred.
It was in 2000, the Patriarch Ignatius Zakka I Iwas, through bull dated 4th April, canonized Mor Osthatheos Sleebo and Mor Gregorios`Abded Galeel, thereby permitting to recite the ‘Quqalya’ hymns and prayers of the ‘Zadeeqo’ (saints) at their tombs and beseech their intercession (Patriarchal Encyclical dated April 9th, 2000). Later in 2005, the bull allowing to recite the name of St. Osthatheos Sleeba, in the 5th ‘Tubden’ (diptych), read in Arthat St. Mary’s Simhasana Church where the mortal remains of the holy father is interred, was issued and now through the latest historical bull His Holiness the Patriarch has allowed to recite the holy father’s name in all the Malankara Syrian churches.