Harivamsa Parva of Mahabharata in 2.125.41

रुद्रस्य परमो विष्णुर्विष्णोश्च परम: शिवः ।
एक एव द्विधा भूतो लोके चरति नित्यसः ॥
rudrasya paramo viShNurviShNoshcha paramaH shivaH |
eka eva dvidhA bhUto loke charati nityashaH ||2.125.41

The supreme lord of Rudra (Shiva) is Vishnu and the supreme lord of Vishnu is Shiva. The same lord is moving in the world always in two forms.

Also in Harivamsha Parva of Mahabharata in 2.125.29

शिवाय विष्णुरूपाय विष्णवे शिवरूपिणे ।
यथान्तरं न पश्यमि तेन तौ दिशतः शिवम् ॥
shivAya viShNurUpAya viShNave shivarUpiNe |
yathAntaraM na pashyAmi tena tau dishataH shivam || 2.125.29

Shiva is in the form of Vishnu and Vishnu is in the form of Shiva. There is no difference between them and both provide Auspiciousness.

The following Shloka is found in YajurVeda

शिवाय विष्णु रूपाय शिव रूपाय विष्णवे |
शिवस्य हृदयं विष्णुं विष्णोश्च हृदयं शिवः ||
यथा शिवमयो विष्णुरेवं विष्णुमयः शिवः |
यथाsन्तरम् न पश्यामि तथा में स्वस्तिरायुषि|
यथाsन्तरं न भेदा: स्यु: शिवराघवयोस्तथा||

Shiva is in the form of Vishnu, as Vishnu is in the form of Shiva . Shiva is in the heart of Vishnu as Vishnu is in the heart of Shiva.

Shiv is full of Vishnu and Vishnu is full of Shiva the one who didn't find them different live a happy life and opposite is also true.

यो विष्णुः स महादेवः शिवो नारायणः स्वयम् ॥ नानयोर्विद्यते भेदः कदाचिदपि कुत्रचित् ।

(Śrī Viṣṇu is same as Śrī Rudra and Śiva is himself Nārāyana ,there is never any difference between the two.)

~ Dēvī Purān.

M.B. Santi Parva 341:22 – 27. Narayana is the Self of Rudra it should be known from age to age. If that god of gods (Maheshvara) be worshipped, then O Partha, is the mighty Narayana also worshipped. I [Krishna] am the Self, O Arjuna of all the worlds, of all the universe. Rudra again is my Self. It is for this reason that I always adore him. If I do not adore the auspicious and boon-giving Isana nobody would then adore Me in essence. The principles I set are followed by all the worlds. Those principles should always be respected, and it is, there­fore, that I too respect them. He who knows Rudra knows Myself, and he who knows Me knows Rudra. He who follows Rudra follows Me. Rudra is Narayana. Both are one Being, appearing in two different forms. Rudra and Narayana, forming one Being, pervade all things and cause them to act.

~

Those who do the difference between these two and consider one as superior and other as inferior- HARIHAR BHALA KARE AAPKA !

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Question - Why women are not allowed in temples during periods ?

Answer - I am gonna make it a whole chapter on this ! Cause every aspect is too long to write here in answers. 

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Today you can ask any question. I'll try to answer it <3