Ghulam Ahmad on lies and liars

Lying is no less than becoming a murtad (apostate)

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"Jhoot bolna murtad honay say kam nahin."

Translation:
"Telling a lie is no less than becoming an apostate."

— (Ruhani Khazain, Vol. 17, p. 56)

Lying is akin to eating feces

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"Ae be-baak logo! Jhoot bolna aur gooh khana aik barabar hai."

Translation:
"O fearless people! Telling a lie and eating feces are one and the same."

— (Ruhani Khazain, Vol. 22, p. 215, Haqiqatul Wahi)

Lying in one matter makes you untrustworthy in others

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"Zahir hai keh jab aik baat mein koi jhoota sabit ho jaye tou phir doosri baaton mein bhi us par aitebaar nahi rehta."

Translation:
"It is obvious that when someone is proven a liar in one matter, then he cannot be trusted in other matters either."

— (Ruhani Khazain, Vol. 23, p. 231, Chashma-e-Marifat)

Conclusion

These statements are important when examining the life and claims of Ghulam Ahmad because they show how seriously he regarded dishonesty. He did not treat lying as merely an ordinary human mistake. He described it in extremely strong terms, even associating it with apostasy and comparing it to the (guh kaanah) consumption of faeces. 

More importantly, he set out a clear principle for judging a person's honesty. If someone is shown to have lied about even one matter, he argued that their credibility is destroyed and that they can no longer be trusted in other matters. That standard can therefore be applied to Ghulam Ahmad himself. His writings, prophecies and historical claims can all be examined against the standard he established. 

If he can be shown to have deliberately fabricated or lied about even one matter, then his own principle raises a much broader question about whether his other claims can still be regarded as trustworthy.