2 verses have
“sineen”
in Edition English Transliteration / Ash-Shu'araa (The Poets)
26:18Qaala alam nurabbika feenaa waleedanw wa labista feenaa min 'umurika sineen
26:205Aara'aita im matta'naahum sineen
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Those who spend their wealth by night and day, privately and publicly, will receive their reward from their Lord. They have nothing to fear, nor shall they grieve.
The Holy Quran · Al-Baqara (The Cow) · 2:274