It is narrated from Hazrat Aisha that when the Prophet (peace be upon him) intended to perform ghusl after janabah, he would rinse his mouth three times and put water into his nose three times.
Hadith Referenceمسند احمد / مسند النساء / 24841
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد حسن، سمع زائدة من عطاء قبل الاختلاط