It wasnarrated from Sa'd bin Abu Waqqas that the Messenger of Allah(ﷺ)said:
'Weep, and if you cannot weep then pretend to weep." (JA)
English reference (JA): Vol. 5, Book 37, Hadith 4196 (JA)
Arabic reference (JA): Book 37, Hadith 4336 (JA)