Rigveda says -
इन्द्रं मित्रं वरुणमग्निमाहुरथो दिव्यः स सुपर्णो गरुत्मान् ।
एकं सद्विप्रा बहुधा वदन्त्यग्निं यमं मातरिश्वानमाहुः ।।
It is the one and only Parmeshwara the scholars call by
different names – Indra, Agni, Yama, Varuna……..
Even if the specific yajna is meant for gods such as Indra,
they all go to Parameshwara only.
तद्यदिदमाहुरमुं यजामुं यजेत्येकैकं देवमेतस्यैव सा विसृष्टिरेष ह्यु सर्वे देवाः.- says Brihadaranyaka Upanishad
they say - worship this God, worship that God, it is the one and only supreme
being, Parameshwara that is worshipped. The individual Gods are all projections
of this Parameshwara. They are all like the organs of the same body. One and
only body. Food consumed by the mouth nourishes the whole body. The same blood
circulates in the whole body. All these gods are interconnected. They are all
part of the same being. When any one of them is worshipped, HE alone is worshipped.